-> libksba: fix CVE-2022-3515 -> libksba: integer overflow may lead to remote code execution.
-> Reference: -> https://www.gnupg.org/blog/20221017-pepe-left-the-ksba.html -> Upstream fixes: -> https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git;a=commit;h=4b7d9cd4a018898d7714ce06f3faf2626c14582b --- ...e-overflow-directly-in-the-TLV-parse.patch | 42 +++++++++++++++++++ meta/recipes-support/libksba/libksba_1.6.2.bb | 3 +- 2 files changed, 44 insertions(+), 1 deletion(-) create mode 100644 meta/recipes-support/libksba/libksba/0001-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch diff --git a/meta/recipes-support/libksba/libksba/0001-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch b/meta/recipes-support/libksba/libksba/0001-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch new file mode 100644 index 0000000000..e2cb842a4d --- /dev/null +++ b/meta/recipes-support/libksba/libksba/0001-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch @@ -0,0 +1,42 @@ +From 4b7d9cd4a018898d7714ce06f3faf2626c14582b Mon Sep 17 00:00:00 2001 +From: Werner Koch <w...@gnupg.org> +Date: Wed, 5 Oct 2022 14:19:06 +0200 +Subject: [PATCH] Detect a possible overflow directly in the TLV parser. + +* src/ber-help.c (_ksba_ber_read_tl): Check for overflow of a commonly +used sum. +-- + +It is quite common to have checks like + + if (ti.nhdr + ti.length >= DIM(tmpbuf)) + return gpg_error (GPG_ERR_TOO_LARGE); + +This patch detects possible integer overflows immmediately when +creating the TI object. + +Reported-by: ZDI-CAN-18927, ZDI-CAN-18928, ZDI-CAN-18929 +--- + src/ber-help.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +diff --git a/src/ber-help.c b/src/ber-help.c +index 81c31ed..56efb6a 100644 +--- a/src/ber-help.c ++++ b/src/ber-help.c +@@ -182,6 +182,12 @@ _ksba_ber_read_tl (ksba_reader_t reader, struct tag_info *ti) + ti->length = len; + } + ++ if (ti->length > ti->nhdr && (ti->nhdr + ti->length) < ti->length) ++ { ++ ti->err_string = "header+length would overflow"; ++ return gpg_error (GPG_ERR_EOVERFLOW); ++ } ++ + /* Without this kludge some example certs can't be parsed */ + if (ti->class == CLASS_UNIVERSAL && !ti->tag) + ti->length = 0; +-- +2.34.1 + diff --git a/meta/recipes-support/libksba/libksba_1.6.2.bb b/meta/recipes-support/libksba/libksba_1.6.2.bb index f6ecb9aec4..c25c23ef0f 100644 --- a/meta/recipes-support/libksba/libksba_1.6.2.bb +++ b/meta/recipes-support/libksba/libksba_1.6.2.bb @@ -22,7 +22,8 @@ inherit autotools binconfig-disabled pkgconfig texinfo UPSTREAM_CHECK_URI = "https://gnupg.org/download/index.html"; SRC_URI = "${GNUPG_MIRROR}/${BPN}/${BPN}-${PV}.tar.bz2 \ - file://ksba-add-pkgconfig-support.patch" + file://ksba-add-pkgconfig-support.patch \ + file://0001-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch" SRC_URI[sha256sum] = "fce01ccac59812bddadffacff017dac2e4762bdb6ebc6ffe06f6ed4f6192c971" -- 2.34.1
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