gnu: libtasn1: Fix CVE-2017-6891.

* gnu/packages/patches/libtasn1-CVE-2017-6891.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/tls.scm (libtasn1)[replacement]: New field.
(libtasn1/fixed): New variable.
This commit is contained in:
Leo Famulari 2017-05-24 16:25:54 -04:00
parent 4ed390a0e7
commit ff51a87cae
No known key found for this signature in database
GPG key ID: 2646FA30BACA7F08
3 changed files with 63 additions and 1 deletions

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@ -745,6 +745,7 @@ dist_patch_DATA = \
%D%/packages/patches/libsndfile-CVE-2017-8362.patch \
%D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch \
%D%/packages/patches/libtar-CVE-2013-4420.patch \
%D%/packages/patches/libtasn1-CVE-2017-6891.patch \
%D%/packages/patches/libtheora-config-guess.patch \
%D%/packages/patches/libtiff-CVE-2016-10092.patch \
%D%/packages/patches/libtiff-CVE-2016-10093.patch \

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@ -0,0 +1,51 @@
Fix CVE-2017-6891:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6891
Patch copied from upstream source repository:
https://git.savannah.gnu.org/cgit/libtasn1.git/commit/?id=5520704d075802df25ce4ffccc010ba1641bd484
From 5520704d075802df25ce4ffccc010ba1641bd484 Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Thu, 18 May 2017 18:03:34 +0200
Subject: [PATCH] asn1_find_node: added safety check on asn1_find_node()
This prevents a stack overflow in asn1_find_node() which
is triggered by too long variable names in the definitions
files. That means that applications have to deliberately
pass a too long 'name' constant to asn1_write_value()
and friends. Reported by Jakub Jirasek.
Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
---
lib/parser_aux.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/lib/parser_aux.c b/lib/parser_aux.c
index b4a7370..976ab38 100644
--- a/lib/parser_aux.c
+++ b/lib/parser_aux.c
@@ -120,6 +120,9 @@ asn1_find_node (asn1_node pointer, const char *name)
if (n_end)
{
nsize = n_end - n_start;
+ if (nsize >= sizeof(n))
+ return NULL;
+
memcpy (n, n_start, nsize);
n[nsize] = 0;
n_start = n_end;
@@ -158,6 +161,9 @@ asn1_find_node (asn1_node pointer, const char *name)
if (n_end)
{
nsize = n_end - n_start;
+ if (nsize >= sizeof(n))
+ return NULL;
+
memcpy (n, n_start, nsize);
n[nsize] = 0;
n_start = n_end;
--
2.13.0

View file

@ -52,6 +52,7 @@ (define-module (gnu packages tls)
(define-public libtasn1
(package
(name "libtasn1")
(replacement libtasn1/fixed)
(version "4.10")
(source
(origin
@ -72,6 +73,15 @@ (define-public libtasn1
specifications.")
(license license:lgpl2.0+)))
(define libtasn1/fixed
(package
(inherit libtasn1)
(source
(origin
(inherit (package-source libtasn1))
(patches
(search-patches "libtasn1-CVE-2017-6891.patch"))))))
(define-public asn1c
(package
(name "asn1c")