diff options
Diffstat (limited to 'gnu/packages/patches/libtasn1-CVE-2018-6003.patch')
| -rw-r--r-- | gnu/packages/patches/libtasn1-CVE-2018-6003.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gnu/packages/patches/libtasn1-CVE-2018-6003.patch b/gnu/packages/patches/libtasn1-CVE-2018-6003.patch new file mode 100644 index 0000000000..3e6140518d --- /dev/null +++ b/gnu/packages/patches/libtasn1-CVE-2018-6003.patch @@ -0,0 +1,73 @@ +Fix CVE-2018-6003: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6003 +https://lists.gnu.org/archive/html/help-libtasn1/2018-01/msg00000.html + +Patch copied from upstream source repository: + +https://gitlab.com/gnutls/libtasn1/commit/c593ae84cfcde8fea45787e53950e0ac71e9ca97 + +From c593ae84cfcde8fea45787e53950e0ac71e9ca97 Mon Sep 17 00:00:00 2001 +From: Nikos Mavrogiannopoulos <nmav@redhat.com> +Date: Thu, 4 Jan 2018 10:52:05 +0100 +Subject: [PATCH] _asn1_decode_simple_ber: restrict the levels of recursion to 3 + +On indefinite string decoding, setting a maximum level of recursions +protects the BER decoder from a stack exhaustion due to large amounts +of recursion. + +Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com> +--- + lib/decoding.c | 21 +++++++++++++++++++-- + 1 file changed, 19 insertions(+), 2 deletions(-) + +diff --git a/lib/decoding.c b/lib/decoding.c +index 2240b09..0ee35d3 100644 +--- a/lib/decoding.c ++++ b/lib/decoding.c +@@ -45,6 +45,13 @@ + + #define DECODE_FLAG_HAVE_TAG 1 + #define DECODE_FLAG_INDEFINITE (1<<1) ++/* On indefinite string decoding, allow this maximum levels ++ * of recursion. Allowing infinite recursion, makes the BER ++ * decoder susceptible to stack exhaustion due to that recursion. ++ */ ++#define DECODE_FLAG_LEVEL1 (1<<2) ++#define DECODE_FLAG_LEVEL2 (1<<3) ++#define DECODE_FLAG_LEVEL3 (1<<4) + + #define DECR_LEN(l, s) do { \ + l -= s; \ +@@ -2216,7 +2223,8 @@ _asn1_decode_simple_ber (unsigned int etype, const unsigned char *der, + } + + /* indefinite constructed */ +- if (((dflags & DECODE_FLAG_INDEFINITE) || class == ASN1_CLASS_STRUCTURED) && ETYPE_IS_STRING(etype)) ++ if ((((dflags & DECODE_FLAG_INDEFINITE) || class == ASN1_CLASS_STRUCTURED) && ETYPE_IS_STRING(etype)) && ++ !(dflags & DECODE_FLAG_LEVEL3)) + { + len_len = 1; + +@@ -2236,8 +2244,17 @@ _asn1_decode_simple_ber (unsigned int etype, const unsigned char *der, + do + { + unsigned tmp_len; ++ unsigned flags = DECODE_FLAG_HAVE_TAG; ++ ++ if (dflags & DECODE_FLAG_LEVEL1) ++ flags |= DECODE_FLAG_LEVEL2; ++ else if (dflags & DECODE_FLAG_LEVEL2) ++ flags |= DECODE_FLAG_LEVEL3; ++ else ++ flags |= DECODE_FLAG_LEVEL1; + +- result = asn1_decode_simple_ber(etype, p, der_len, &out, &out_len, &tmp_len); ++ result = _asn1_decode_simple_ber(etype, p, der_len, &out, &out_len, &tmp_len, ++ flags); + if (result != ASN1_SUCCESS) + { + warn(); +-- +libgit2 0.26.0 + |