aboutsummaryrefslogtreecommitdiff
path: root/gnu/packages/patches/libtasn1-CVE-2018-6003.patch
diff options
context:
space:
mode:
Diffstat (limited to 'gnu/packages/patches/libtasn1-CVE-2018-6003.patch')
-rw-r--r--gnu/packages/patches/libtasn1-CVE-2018-6003.patch73
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
+