A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient.
reference: https://www.openwall.com/lists/oss-security/2021/05/26/6 https://kb.isc.org/docs/cve-2021-25217 --- .../dhcp/dhcp/CVE-2021-25217.patch | 66 +++++++++++++++++++ meta/recipes-connectivity/dhcp/dhcp_4.4.2.bb | 1 + 2 files changed, 67 insertions(+) create mode 100644 meta/recipes-connectivity/dhcp/dhcp/CVE-2021-25217.patch diff --git a/meta/recipes-connectivity/dhcp/dhcp/CVE-2021-25217.patch b/meta/recipes-connectivity/dhcp/dhcp/CVE-2021-25217.patch new file mode 100644 index 0000000000..91aaf83a77 --- /dev/null +++ b/meta/recipes-connectivity/dhcp/dhcp/CVE-2021-25217.patch @@ -0,0 +1,66 @@ +From 5a7344b05081d84343a1627e47478f3990b17700 Mon Sep 17 00:00:00 2001 +From: Minjae Kim <flower...@gmail.com> +Date: Thu, 8 Jul 2021 00:08:25 +0000 +Subject: [PATCH] ISC has disclosed a vulnerability in ISC DHCP + (CVE-2021-25217) + +On May 26, 2021, we (Internet Systems Consortium) disclosed a +vulnerability affecting our ISC DHCP software: + + CVE-2021-25217: A buffer overrun in lease file parsing code can be + used to exploit a common vulnerability shared by dhcpd and dhclient + https://kb.isc.org/docs/cve-2021-25217 + +New versions of ISC DHCP are available from https://www.isc.org/downloads + +Operators and package maintainers who prefer to apply patches selectively can +find individual vulnerability-specific patches in the "patches" subdirectory +of the release directories for our two stable release branches (4.4 and 4.1-ESV) + + https://downloads.isc.org/isc/dhcp/4.4.2-P1/patches + https://downloads.isc.org/isc/dhcp/4.1-ESV-R16-P1/patches + +With the public announcement of this vulnerability, the embargo +period is ended and any updated software packages that have been +prepared may be released. + +Upstream-Status: Accepted [https://www.openwall.com/lists/oss-security/2021/05/26/6] +CVE: CVE-2021-25217 +Signed-off-by: Minjae Kim <flower...@gmail.com> +--- + common/parse.c | 7 ++++--- + 1 file changed, 4 insertions(+), 3 deletions(-) + +diff --git a/common/parse.c b/common/parse.c +index 386a632..fc7b39c 100644 +--- a/common/parse.c ++++ b/common/parse.c +@@ -3,7 +3,7 @@ + Common parser code for dhcpd and dhclient. */ + + /* +- * Copyright (c) 2004-2019 by Internet Systems Consortium, Inc. ("ISC") ++ * Copyright (c) 2004-2021 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1995-2003 by Internet Software Consortium + * + * This Source Code Form is subject to the terms of the Mozilla Public +@@ -5556,13 +5556,14 @@ int parse_X (cfile, buf, max) + skip_to_semi (cfile); + return 0; + } +- convert_num (cfile, &buf [len], val, 16, 8); +- if (len++ > max) { ++ if (len >= max) { + parse_warn (cfile, + "hexadecimal constant too long."); + skip_to_semi (cfile); + return 0; + } ++ convert_num (cfile, &buf [len], val, 16, 8); ++ len++; + token = peek_token (&val, (unsigned *)0, cfile); + if (token == COLON) + token = next_token (&val, +-- +2.17.1 + diff --git a/meta/recipes-connectivity/dhcp/dhcp_4.4.2.bb b/meta/recipes-connectivity/dhcp/dhcp_4.4.2.bb index b56a204821..5609a350cc 100644 --- a/meta/recipes-connectivity/dhcp/dhcp_4.4.2.bb +++ b/meta/recipes-connectivity/dhcp/dhcp_4.4.2.bb @@ -10,6 +10,7 @@ SRC_URI += "file://0001-define-macro-_PATH_DHCPD_CONF-and-_PATH_DHCLIENT_CON.pat file://0012-dhcp-correct-the-intention-for-xml2-lib-search.patch \ file://0013-fixup_use_libbind.patch \ file://0001-workaround-busybox-limitation-in-linux-dhclient-script.patch \ + file://CVE-2021-25217.patch \ " SRC_URI[md5sum] = "2afdaf8498dc1edaf3012efdd589b3e1" -- 2.24.3 (Apple Git-128)
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