From: rajmohan r <rajmoha...@kpit.com> Below patch files to fix CVE-2023-26604 CVE-2023-26604-1.patch, CVE-2023-26604-2.patch and CVE-2023-26604-3.patch and CVE-2023-26604-4.patch
make pager secure when under euid is changed or explicitly requested Reference: CVE-2023-26604-1.patch: https://github.com/systemd/systemd/pull/17270/commits/612ebf6c913dd0e4197c44909cb3157f5c51a2f0 CVE-2023-26604-2.patch: https://github.com/systemd/systemd/pull/17270/commits/1b5b507cd2d1d7a2b053151abb548475ad9c5c3b CVE-2023-26604-3.patch: https://github.com/systemd/systemd/pull/17270/commits/0a42426d797406b4b01a0d9c13bb759c2629d108 CVE-2023-26604-4.patch: https://github.com/systemd/systemd/pull/17359/commits/b8f736b30e20a2b44e7c34bb4e43b0d97ae77e3c Signed-off-by: rajmohan r <rajmoha...@kpit.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- .../systemd/systemd/CVE-2023-26604-1.patch | 115 ++++++++ .../systemd/systemd/CVE-2023-26604-2.patch | 264 ++++++++++++++++++ .../systemd/systemd/CVE-2023-26604-3.patch | 182 ++++++++++++ .../systemd/systemd/CVE-2023-26604-4.patch | 32 +++ meta/recipes-core/systemd/systemd_244.5.bb | 4 + 5 files changed, 597 insertions(+) create mode 100644 meta/recipes-core/systemd/systemd/CVE-2023-26604-1.patch create mode 100644 meta/recipes-core/systemd/systemd/CVE-2023-26604-2.patch create mode 100644 meta/recipes-core/systemd/systemd/CVE-2023-26604-3.patch create mode 100644 meta/recipes-core/systemd/systemd/CVE-2023-26604-4.patch diff --git a/meta/recipes-core/systemd/systemd/CVE-2023-26604-1.patch b/meta/recipes-core/systemd/systemd/CVE-2023-26604-1.patch new file mode 100644 index 0000000000..39f9480cf8 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/CVE-2023-26604-1.patch @@ -0,0 +1,115 @@ +From 612ebf6c913dd0e4197c44909cb3157f5c51a2f0 Mon Sep 17 00:00:00 2001 +From: Lennart Poettering <lenn...@poettering.net> +Date: Mon, 31 Aug 2020 19:37:13 +0200 +Subject: [PATCH] pager: set $LESSSECURE whenver we invoke a pager + +Some extra safety when invoked via "sudo". With this we address a +genuine design flaw of sudo, and we shouldn't need to deal with this. +But it's still a good idea to disable this surface given how exotic it +is. + +Prompted by #5666 + +CVE: CVE-2023-26604 +Upstream-Status: Backport [https://github.com/systemd/systemd/pull/17270/commits/612ebf6c913dd0e4197c44909cb3157f5c51a2f0] +Comments: Hunk not refreshed +Signed-off-by: rajmohan r <rajmoha...@kpit.com> +--- + man/less-variables.xml | 9 +++++++++ + man/systemctl.xml | 1 + + man/systemd.xml | 1 + + src/shared/pager.c | 23 +++++++++++++++++++++-- + 4 files changed, 32 insertions(+), 2 deletions(-) + +diff --git a/man/less-variables.xml b/man/less-variables.xml +index 08e513c99f8e..c52511ca8e18 100644 +--- a/man/less-variables.xml ++++ b/man/less-variables.xml +@@ -64,6 +64,15 @@ + the invoking terminal is determined to be UTF-8 compatible).</para></listitem> + </varlistentry> + ++ <varlistentry id='lesssecure'> ++ <term><varname>$SYSTEMD_LESSSECURE</varname></term> ++ ++ <listitem><para>Takes a boolean argument. Overrides the <varname>$LESSSECURE</varname> environment ++ variable when invoking the pager, which controls the "secure" mode of less (which disables commands ++ such as <literal>|</literal> which allow to easily shell out to external command lines). By default ++ less secure mode is enabled, with this setting it may be disabled.</para></listitem> ++ </varlistentry> ++ + <varlistentry id='colors'> + <term><varname>$SYSTEMD_COLORS</varname></term> + +diff --git a/man/systemctl.xml b/man/systemctl.xml +index 1c5502883700..a3f0c3041a57 100644 +--- a/man/systemctl.xml ++++ b/man/systemctl.xml +@@ -2240,6 +2240,7 @@ Jan 12 10:46:45 example.com bluetoothd[8900]: gatt-time-server: Input/output err + <xi:include href="less-variables.xml" xpointer="pager"/> + <xi:include href="less-variables.xml" xpointer="less"/> + <xi:include href="less-variables.xml" xpointer="lesscharset"/> ++ <xi:include href="less-variables.xml" xpointer="lesssecure"/> + <xi:include href="less-variables.xml" xpointer="colors"/> + <xi:include href="less-variables.xml" xpointer="urlify"/> + </refsect1> +diff --git a/man/systemd.xml b/man/systemd.xml +index a9040545c2ab..c92cfef77689 100644 +--- a/man/systemd.xml ++++ b/man/systemd.xml +@@ -692,6 +692,7 @@ + <xi:include href="less-variables.xml" xpointer="pager"/> + <xi:include href="less-variables.xml" xpointer="less"/> + <xi:include href="less-variables.xml" xpointer="lesscharset"/> ++ <xi:include href="less-variables.xml" xpointer="lesssecure"/> + <xi:include href="less-variables.xml" xpointer="colors"/> + <xi:include href="less-variables.xml" xpointer="urlify"/> + +diff --git a/src/shared/pager.c b/src/shared/pager.c +index e03be6d23b2d..9c21881241f5 100644 +--- a/src/shared/pager.c ++++ b/src/shared/pager.c +@@ -9,6 +9,7 @@ + #include <unistd.h> + + #include "copy.h" ++#include "env-util.h" + #include "fd-util.h" + #include "fileio.h" + #include "io-util.h" +@@ -152,8 +153,7 @@ int pager_open(PagerFlags flags) { + _exit(EXIT_FAILURE); + } + +- /* Initialize a good charset for less. This is +- * particularly important if we output UTF-8 ++ /* Initialize a good charset for less. This is particularly important if we output UTF-8 + * characters. */ + less_charset = getenv("SYSTEMD_LESSCHARSET"); + if (!less_charset && is_locale_utf8()) +@@ -164,6 +164,25 @@ int pager_open(PagerFlags flags) { + _exit(EXIT_FAILURE); + } + ++ /* People might invoke us from sudo, don't needlessly allow less to be a way to shell out ++ * privileged stuff. */ ++ r = getenv_bool("SYSTEMD_LESSSECURE"); ++ if (r == 0) { /* Remove env var if off */ ++ if (unsetenv("LESSSECURE") < 0) { ++ log_error_errno(errno, "Failed to uset environment variable LESSSECURE: %m"); ++ _exit(EXIT_FAILURE); ++ } ++ } else { ++ /* Set env var otherwise */ ++ if (r < 0) ++ log_warning_errno(r, "Unable to parse $SYSTEMD_LESSSECURE, ignoring: %m"); ++ ++ if (setenv("LESSSECURE", "1", 1) < 0) { ++ log_error_errno(errno, "Failed to set environment variable LESSSECURE: %m"); ++ _exit(EXIT_FAILURE); ++ } ++ } ++ + if (pager_args) { + r = loop_write(exe_name_pipe[1], pager_args[0], strlen(pager_args[0]) + 1, false); + if (r < 0) { diff --git a/meta/recipes-core/systemd/systemd/CVE-2023-26604-2.patch b/meta/recipes-core/systemd/systemd/CVE-2023-26604-2.patch new file mode 100644 index 0000000000..95da7cfad6 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/CVE-2023-26604-2.patch @@ -0,0 +1,264 @@ +From 1b5b507cd2d1d7a2b053151abb548475ad9c5c3b Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbys...@in.waw.pl> +Date: Mon, 12 Oct 2020 18:57:32 +0200 +Subject: [PATCH] test-login: always test sd_pid_get_owner_uid(), modernize + +A long time some function only worked when in a session, and the test +didn't execute them when sd_pid_get_session() failed. Let's always call +them to increase coverage. + +While at it, let's test for ==0 not >=0 where we don't expect the function +to return anything except 0 or error. + +CVE: CVE-2023-26604 +Upstream-Status: Backport [https://github.com/systemd/systemd/pull/17270/commits/1b5b507cd2d1d7a2b053151abb548475ad9c5c3b.patch] +Comments: Hunk not refreshed +Signed-off-by: rajmohan r <rajmoha...@kpit.com> +--- + src/libsystemd/sd-login/test-login.c | 131 ++++++++++++++------------- + 1 file changed, 70 insertions(+), 61 deletions(-) + +diff --git a/src/libsystemd/sd-login/test-login.c b/src/libsystemd/sd-login/test-login.c +index c0c77e04714b..0494fc77ba18 100644 +--- a/src/libsystemd/sd-login/test-login.c ++++ b/src/libsystemd/sd-login/test-login.c +@@ -5,21 +5,22 @@ + #include "sd-login.h" + + #include "alloc-util.h" ++#include "errno-list.h" + #include "fd-util.h" + #include "format-util.h" + #include "log.h" + #include "string-util.h" + #include "strv.h" + #include "time-util.h" +-#include "util.h" ++#include "user-util.h" + + static char* format_uids(char **buf, uid_t* uids, int count) { +- int pos = 0, k, inc; ++ int pos = 0, inc; + size_t size = (DECIMAL_STR_MAX(uid_t) + 1) * count + 1; + + assert_se(*buf = malloc(size)); + +- for (k = 0; k < count; k++) { ++ for (int k = 0; k < count; k++) { + sprintf(*buf + pos, "%s"UID_FMT"%n", k > 0 ? " " : "", uids[k], &inc); + pos += inc; + } +@@ -30,6 +31,10 @@ static char* format_uids(char **buf, uid_t* uids, int count) { + return *buf; + } + ++static const char *e(int r) { ++ return r == 0 ? "OK" : errno_to_name(r); ++} ++ + static void test_login(void) { + _cleanup_close_pair_ int pair[2] = { -1, -1 }; + _cleanup_free_ char *pp = NULL, *qq = NULL, +@@ -39,65 +44,71 @@ static void test_login(void) { + *seat = NULL, *session = NULL, + *unit = NULL, *user_unit = NULL, *slice = NULL; + int r; +- uid_t u, u2; +- char *t, **seats, **sessions; ++ uid_t u, u2 = UID_INVALID; ++ char *t, **seats = NULL, **sessions = NULL; + + r = sd_pid_get_unit(0, &unit); +- assert_se(r >= 0 || r == -ENODATA); +- log_info("sd_pid_get_unit(0, …) → \"%s\"", strna(unit)); ++ log_info("sd_pid_get_unit(0, …) → %s / \"%s\"", e(r), strnull(unit)); ++ assert_se(IN_SET(r, 0, -ENODATA)); + + r = sd_pid_get_user_unit(0, &user_unit); +- assert_se(r >= 0 || r == -ENODATA); +- log_info("sd_pid_get_user_unit(0, …) → \"%s\"", strna(user_unit)); ++ log_info("sd_pid_get_user_unit(0, …) → %s / \"%s\"", e(r), strnull(user_unit)); ++ assert_se(IN_SET(r, 0, -ENODATA)); + + r = sd_pid_get_slice(0, &slice); +- assert_se(r >= 0 || r == -ENODATA); +- log_info("sd_pid_get_slice(0, …) → \"%s\"", strna(slice)); ++ log_info("sd_pid_get_slice(0, …) → %s / \"%s\"", e(r), strnull(slice)); ++ assert_se(IN_SET(r, 0, -ENODATA)); ++ ++ r = sd_pid_get_owner_uid(0, &u2); ++ log_info("sd_pid_get_owner_uid(0, …) → %s / "UID_FMT, e(r), u2); ++ assert_se(IN_SET(r, 0, -ENODATA)); + + r = sd_pid_get_session(0, &session); +- if (r < 0) { +- log_warning_errno(r, "sd_pid_get_session(0, …): %m"); +- if (r == -ENODATA) +- log_info("Seems we are not running in a session, skipping some tests."); +- } else { +- log_info("sd_pid_get_session(0, …) → \"%s\"", session); +- +- assert_se(sd_pid_get_owner_uid(0, &u2) == 0); +- log_info("sd_pid_get_owner_uid(0, …) → "UID_FMT, u2); +- +- assert_se(sd_pid_get_cgroup(0, &cgroup) == 0); +- log_info("sd_pid_get_cgroup(0, …) → \"%s\"", cgroup); +- +- r = sd_uid_get_display(u2, &display_session); +- assert_se(r >= 0 || r == -ENODATA); +- log_info("sd_uid_get_display("UID_FMT", …) → \"%s\"", +- u2, strnull(display_session)); +- +- assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == 0); +- sd_peer_get_session(pair[0], &pp); +- sd_peer_get_session(pair[1], &qq); +- assert_se(streq_ptr(pp, qq)); +- +- r = sd_uid_get_sessions(u2, false, &sessions); ++ log_info("sd_pid_get_session(0, …) → %s / \"%s\"", e(r), strnull(session)); ++ ++ r = sd_pid_get_cgroup(0, &cgroup); ++ log_info("sd_pid_get_cgroup(0, …) → %s / \"%s\"", e(r), strnull(cgroup)); ++ assert_se(r == 0); ++ ++ r = sd_uid_get_display(u2, &display_session); ++ log_info("sd_uid_get_display("UID_FMT", …) → %s / \"%s\"", u2, e(r), strnull(display_session)); ++ if (u2 == UID_INVALID) ++ assert_se(r == -EINVAL); ++ else ++ assert_se(IN_SET(r, 0, -ENODATA)); ++ ++ assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == 0); ++ sd_peer_get_session(pair[0], &pp); ++ sd_peer_get_session(pair[1], &qq); ++ assert_se(streq_ptr(pp, qq)); ++ ++ r = sd_uid_get_sessions(u2, false, &sessions); ++ assert_se(t = strv_join(sessions, " ")); ++ log_info("sd_uid_get_sessions("UID_FMT", …) → %s \"%s\"", u2, e(r), t); ++ if (u2 == UID_INVALID) ++ assert_se(r == -EINVAL); ++ else { + assert_se(r >= 0); + assert_se(r == (int) strv_length(sessions)); +- assert_se(t = strv_join(sessions, " ")); +- strv_free(sessions); +- log_info("sd_uid_get_sessions("UID_FMT", …) → [%i] \"%s\"", u2, r, t); +- free(t); ++ } ++ sessions = strv_free(sessions); ++ free(t); + +- assert_se(r == sd_uid_get_sessions(u2, false, NULL)); ++ assert_se(r == sd_uid_get_sessions(u2, false, NULL)); + +- r = sd_uid_get_seats(u2, false, &seats); ++ r = sd_uid_get_seats(u2, false, &seats); ++ assert_se(t = strv_join(seats, " ")); ++ log_info("sd_uid_get_seats("UID_FMT", …) → %s \"%s\"", u2, e(r), t); ++ if (u2 == UID_INVALID) ++ assert_se(r == -EINVAL); ++ else { + assert_se(r >= 0); + assert_se(r == (int) strv_length(seats)); +- assert_se(t = strv_join(seats, " ")); +- strv_free(seats); +- log_info("sd_uid_get_seats("UID_FMT", …) → [%i] \"%s\"", u2, r, t); +- free(t); +- +- assert_se(r == sd_uid_get_seats(u2, false, NULL)); + } ++ seats = strv_free(seats); ++ free(t); ++ ++ assert_se(r == sd_uid_get_seats(u2, false, NULL)); + + if (session) { + r = sd_session_is_active(session); +@@ -109,7 +120,7 @@ static void test_login(void) { + log_info("sd_session_is_remote(\"%s\") → %s", session, yes_no(r)); + + r = sd_session_get_state(session, &state); +- assert_se(r >= 0); ++ assert_se(r == 0); + log_info("sd_session_get_state(\"%s\") → \"%s\"", session, state); + + assert_se(sd_session_get_uid(session, &u) >= 0); +@@ -123,16 +134,16 @@ static void test_login(void) { + log_info("sd_session_get_class(\"%s\") → \"%s\"", session, class); + + r = sd_session_get_display(session, &display); +- assert_se(r >= 0 || r == -ENODATA); ++ assert_se(IN_SET(r, 0, -ENODATA)); + log_info("sd_session_get_display(\"%s\") → \"%s\"", session, strna(display)); + + r = sd_session_get_remote_user(session, &remote_user); +- assert_se(r >= 0 || r == -ENODATA); ++ assert_se(IN_SET(r, 0, -ENODATA)); + log_info("sd_session_get_remote_user(\"%s\") → \"%s\"", + session, strna(remote_user)); + + r = sd_session_get_remote_host(session, &remote_host); +- assert_se(r >= 0 || r == -ENODATA); ++ assert_se(IN_SET(r, 0, -ENODATA)); + log_info("sd_session_get_remote_host(\"%s\") → \"%s\"", + session, strna(remote_host)); + +@@ -161,7 +172,7 @@ static void test_login(void) { + assert_se(r == -ENODATA); + } + +- assert_se(sd_uid_get_state(u, &state2) >= 0); ++ assert_se(sd_uid_get_state(u, &state2) == 0); + log_info("sd_uid_get_state("UID_FMT", …) → %s", u, state2); + } + +@@ -173,11 +184,11 @@ static void test_login(void) { + assert_se(sd_uid_is_on_seat(u, 0, seat) > 0); + + r = sd_seat_get_active(seat, &session2, &u2); +- assert_se(r >= 0); ++ assert_se(r == 0); + log_info("sd_seat_get_active(\"%s\", …) → \"%s\", "UID_FMT, seat, session2, u2); + + r = sd_uid_is_on_seat(u, 1, seat); +- assert_se(r >= 0); ++ assert_se(IN_SET(r, 0, 1)); + assert_se(!!r == streq(session, session2)); + + r = sd_seat_get_sessions(seat, &sessions, &uids, &n); +@@ -185,8 +196,8 @@ static void test_login(void) { + assert_se(r == (int) strv_length(sessions)); + assert_se(t = strv_join(sessions, " ")); + strv_free(sessions); +- log_info("sd_seat_get_sessions(\"%s\", …) → %i, \"%s\", [%i] {%s}", +- seat, r, t, n, format_uids(&buf, uids, n)); ++ log_info("sd_seat_get_sessions(\"%s\", …) → %s, \"%s\", [%u] {%s}", ++ seat, e(r), t, n, format_uids(&buf, uids, n)); + free(t); + + assert_se(sd_seat_get_sessions(seat, NULL, NULL, NULL) == r); +@@ -204,7 +215,7 @@ static void test_login(void) { + + r = sd_seat_get_active(NULL, &t, NULL); + assert_se(IN_SET(r, 0, -ENODATA)); +- log_info("sd_seat_get_active(NULL, …) (active session on current seat) → %s", strnull(t)); ++ log_info("sd_seat_get_active(NULL, …) (active session on current seat) → %s / \"%s\"", e(r), strnull(t)); + free(t); + + r = sd_get_sessions(&sessions); +@@ -244,13 +255,11 @@ static void test_login(void) { + + static void test_monitor(void) { + sd_login_monitor *m = NULL; +- unsigned n; + int r; + +- r = sd_login_monitor_new("session", &m); +- assert_se(r >= 0); ++ assert_se(sd_login_monitor_new("session", &m) == 0); + +- for (n = 0; n < 5; n++) { ++ for (unsigned n = 0; n < 5; n++) { + struct pollfd pollfd = {}; + usec_t timeout, nw; diff --git a/meta/recipes-core/systemd/systemd/CVE-2023-26604-3.patch b/meta/recipes-core/systemd/systemd/CVE-2023-26604-3.patch new file mode 100644 index 0000000000..f02f62b772 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/CVE-2023-26604-3.patch @@ -0,0 +1,182 @@ +From 0a42426d797406b4b01a0d9c13bb759c2629d108 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbys...@in.waw.pl> +Date: Wed, 7 Oct 2020 11:15:05 +0200 +Subject: [PATCH] pager: make pager secure when under euid is changed or + explicitly requested + +The variable is renamed to SYSTEMD_PAGERSECURE (because it's not just about +less now), and we automatically enable secure mode in certain cases, but not +otherwise. + +This approach is more nuanced, but should provide a better experience for +users: + +- Previusly we would set LESSSECURE=1 and trust the pager to make use of + it. But this has an effect only on less. We need to not start pagers which + are insecure when in secure mode. In particular more is like that and is a + very popular pager. + +- We don't enable secure mode always, which means that those other pagers can + reasonably used. + +- We do the right thing by default, but the user has ultimate control by + setting SYSTEMD_PAGERSECURE. + +Fixes #5666. + +v2: +- also check $PKEXEC_UID + +v3: +- use 'sd_pid_get_owner_uid() != geteuid()' as the condition + +CVE: CVE-2023-26604 +Upstream-Status: Backport [https://github.com/systemd/systemd/pull/17270/commits/0a42426d797406b4b01a0d9c13bb759c2629d108] +Comments: Hunk refreshed +Signed-off-by: rajmohan r <rajmoha...@kpit.com> +--- + man/less-variables.xml | 30 +++++++++++++++---- + src/shared/pager.c | 63 ++++++++++++++++++++++++++------------- + 2 files changed, 66 insertions(+), 27 deletions(-) + +diff --git a/man/less-variables.xml b/man/less-variables.xml +index c52511c..049e9f7 100644 +--- a/man/less-variables.xml ++++ b/man/less-variables.xml +@@ -65,12 +65,30 @@ + </varlistentry> + + <varlistentry id='lesssecure'> +- <term><varname>$SYSTEMD_LESSSECURE</varname></term> +- +- <listitem><para>Takes a boolean argument. Overrides the <varname>$LESSSECURE</varname> environment +- variable when invoking the pager, which controls the "secure" mode of less (which disables commands +- such as <literal>|</literal> which allow to easily shell out to external command lines). By default +- less secure mode is enabled, with this setting it may be disabled.</para></listitem> ++ <term><varname>$SYSTEMD_PAGERSECURE</varname></term> ++ ++ <listitem><para>Takes a boolean argument. When true, the "secure" mode of the pager is enabled; if ++ false, disabled. If <varname>$SYSTEMD_PAGERSECURE</varname> is not set at all, secure mode is enabled ++ if the effective UID is not the same as the owner of the login session, see <citerefentry ++ project='man-pages'><refentrytitle>geteuid</refentrytitle><manvolnum>2</manvolnum></citerefentry> and ++ <citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>. ++ In secure mode, <option>LESSSECURE=1</option> will be set when invoking the pager, and the pager shall ++ disable commands that open or create new files or start new subprocesses. When ++ <varname>$SYSTEMD_PAGERSECURE</varname> is not set at all, pagers which are not known to implement ++ secure mode will not be used. (Currently only ++ <citerefentry><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> implements ++ secure mode.)</para> ++ ++ <para>Note: when commands are invoked with elevated privileges, for example under <citerefentry ++ project='man-pages'><refentrytitle>sudo</refentrytitle><manvolnum>8</manvolnum></citerefentry> or ++ <citerefentry ++ project='die-net'><refentrytitle>pkexec</refentrytitle><manvolnum>1</manvolnum></citerefentry>, care ++ must be taken to ensure that unintended interactive features are not enabled. "Secure" mode for the ++ pager may be enabled automatically as describe above. Setting <varname>SYSTEMD_PAGERSECURE=0</varname> ++ or not removing it from the inherited environment allows the user to invoke arbitrary commands. Note ++ that if the <varname>$SYSTEMD_PAGER</varname> or <varname>$PAGER</varname> variables are to be ++ honoured, <varname>$SYSTEMD_PAGERSECURE</varname> must be set too. It might be reasonable to completly ++ disable the pager using <option>--no-pager</option> instead.</para></listitem> + </varlistentry> + + <varlistentry id='colors'> +diff --git a/src/shared/pager.c b/src/shared/pager.c +index a3b6576..a72d9ea 100644 +--- a/src/shared/pager.c ++++ b/src/shared/pager.c +@@ -8,6 +8,8 @@ + #include <sys/prctl.h> + #include <unistd.h> + ++#include "sd-login.h" ++ + #include "copy.h" + #include "env-util.h" + #include "fd-util.h" +@@ -164,25 +166,42 @@ int pager_open(PagerFlags flags) { + } + + /* People might invoke us from sudo, don't needlessly allow less to be a way to shell out +- * privileged stuff. */ +- r = getenv_bool("SYSTEMD_LESSSECURE"); +- if (r == 0) { /* Remove env var if off */ +- if (unsetenv("LESSSECURE") < 0) { +- log_error_errno(errno, "Failed to uset environment variable LESSSECURE: %m"); +- _exit(EXIT_FAILURE); +- } +- } else { +- /* Set env var otherwise */ ++ * privileged stuff. If the user set $SYSTEMD_PAGERSECURE, trust their configuration of the ++ * pager. If they didn't, use secure mode when under euid is changed. If $SYSTEMD_PAGERSECURE ++ * wasn't explicitly set, and we autodetect the need for secure mode, only use the pager we ++ * know to be good. */ ++ int use_secure_mode = getenv_bool("SYSTEMD_PAGERSECURE"); ++ bool trust_pager = use_secure_mode >= 0; ++ if (use_secure_mode == -ENXIO) { ++ uid_t uid; ++ ++ r = sd_pid_get_owner_uid(0, &uid); + if (r < 0) +- log_warning_errno(r, "Unable to parse $SYSTEMD_LESSSECURE, ignoring: %m"); ++ log_debug_errno(r, "sd_pid_get_owner_uid() failed, enabling pager secure mode: %m"); + +- if (setenv("LESSSECURE", "1", 1) < 0) { +- log_error_errno(errno, "Failed to set environment variable LESSSECURE: %m"); +- _exit(EXIT_FAILURE); +- } ++ use_secure_mode = r < 0 || uid != geteuid(); ++ ++ } else if (use_secure_mode < 0) { ++ log_warning_errno(use_secure_mode, "Unable to parse $SYSTEMD_PAGERSECURE, assuming true: %m"); ++ use_secure_mode = true; + } + +- if (pager_args) { ++ /* We generally always set variables used by less, even if we end up using a different pager. ++ * They shouldn't hurt in any case, and ideally other pagers would look at them too. */ ++ if (use_secure_mode) ++ r = setenv("LESSSECURE", "1", 1); ++ else ++ r = unsetenv("LESSSECURE"); ++ if (r < 0) { ++ log_error_errno(errno, "Failed to adjust environment variable LESSSECURE: %m"); ++ _exit(EXIT_FAILURE); ++ } ++ ++ if (trust_pager && pager_args) { /* The pager config might be set globally, and we cannot ++ * know if the user adjusted it to be appropriate for the ++ * secure mode. Thus, start the pager specified through ++ * envvars only when $SYSTEMD_PAGERSECURE was explicitly set ++ * as well. */ + r = loop_write(exe_name_pipe[1], pager_args[0], strlen(pager_args[0]) + 1, false); + if (r < 0) { + log_error_errno(r, "Failed to write pager name to socket: %m"); +@@ -194,13 +213,14 @@ int pager_open(PagerFlags flags) { + "Failed to execute '%s', using fallback pagers: %m", pager_args[0]); + } + +- /* Debian's alternatives command for pagers is +- * called 'pager'. Note that we do not call +- * sensible-pagers here, since that is just a +- * shell script that implements a logic that +- * is similar to this one anyway, but is +- * Debian-specific. */ ++ /* Debian's alternatives command for pagers is called 'pager'. Note that we do not call ++ * sensible-pagers here, since that is just a shell script that implements a logic that is ++ * similar to this one anyway, but is Debian-specific. */ + FOREACH_STRING(exe, "pager", "less", "more") { ++ /* Only less implements secure mode right now. */ ++ if (use_secure_mode && !streq(exe, "less")) ++ continue; ++ + r = loop_write(exe_name_pipe[1], exe, strlen(exe) + 1, false); + if (r < 0) { + log_error_errno(r, "Failed to write pager name to socket: %m"); +@@ -211,6 +231,7 @@ int pager_open(PagerFlags flags) { + "Failed to execute '%s', using next fallback pager: %m", exe); + } + ++ /* Our builtin is also very secure. */ + r = loop_write(exe_name_pipe[1], "(built-in)", strlen("(built-in)") + 1, false); + if (r < 0) { + log_error_errno(r, "Failed to write pager name to socket: %m"); diff --git a/meta/recipes-core/systemd/systemd/CVE-2023-26604-4.patch b/meta/recipes-core/systemd/systemd/CVE-2023-26604-4.patch new file mode 100644 index 0000000000..bc6b0a91c2 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/CVE-2023-26604-4.patch @@ -0,0 +1,32 @@ +From b8f736b30e20a2b44e7c34bb4e43b0d97ae77e3c Mon Sep 17 00:00:00 2001 +From: Lennart Poettering <lenn...@poettering.net> +Date: Thu, 15 Oct 2020 10:54:48 +0200 +Subject: [PATCH] pager: lets check SYSTEMD_PAGERSECURE with secure_getenv() + +I can't think of any real vulnerability about this, but it still feels +better to check a variable with "secure" in its name with +secure_getenv() rather than plain getenv(). + +Paranoia FTW! + +CVE: CVE-2023-26604 +Upstream-Status: Backport [https://github.com/systemd/systemd/pull/17359/commits/b8f736b30e20a2b44e7c34bb4e43b0d97ae77e3c] +Comments: Hunk refreshed +Signed-off-by: rajmohan r <rajmoha...@kpit.com> +--- + src/shared/pager.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/src/shared/pager.c b/src/shared/pager.c +index a72d9ea..250519c 100644 +--- a/src/shared/pager.c ++++ b/src/shared/pager.c +@@ -170,7 +170,7 @@ int pager_open(PagerFlags flags) { + * pager. If they didn't, use secure mode when under euid is changed. If $SYSTEMD_PAGERSECURE + * wasn't explicitly set, and we autodetect the need for secure mode, only use the pager we + * know to be good. */ +- int use_secure_mode = getenv_bool("SYSTEMD_PAGERSECURE"); ++ int use_secure_mode = getenv_bool_secure("SYSTEMD_PAGERSECURE"); + bool trust_pager = use_secure_mode >= 0; + if (use_secure_mode == -ENXIO) { + uid_t uid; diff --git a/meta/recipes-core/systemd/systemd_244.5.bb b/meta/recipes-core/systemd/systemd_244.5.bb index 8dd59f7636..bd66d82932 100644 --- a/meta/recipes-core/systemd/systemd_244.5.bb +++ b/meta/recipes-core/systemd/systemd_244.5.bb @@ -35,6 +35,10 @@ SRC_URI += "file://touchscreen.rules \ file://CVE-2021-3997-2.patch \ file://CVE-2021-3997-3.patch \ file://CVE-2022-3821.patch \ + file://CVE-2023-26604-1.patch \ + file://CVE-2023-26604-2.patch \ + file://CVE-2023-26604-3.patch \ + file://CVE-2023-26604-4.patch \ " # patches needed by musl -- 2.34.1
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