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[bug#30416] [PATCH] gnu: libtasn1: Fix CVE-2018-6003.
From: |
Marius Bakke |
Subject: |
[bug#30416] [PATCH] gnu: libtasn1: Fix CVE-2018-6003. |
Date: |
Sun, 11 Feb 2018 02:31:08 +0100 |
User-agent: |
K-9 Mail for Android |
On February 10, 2018 10:54:44 PM GMT+01:00, Leo Famulari <address@hidden> wrote:
>* gnu/packages/patches/libtasn1-CVE-2018-6003.patch: New file.
>* gnu/local.mk (dist_patch_DATA): Add it.
>* gnu/packages/tls.scm (libtasn1/fixed)[source]: Use it.
LGTM. I think we already ungrafted the fixed version on core-updates, so I
guess we should merge and "re-graft" this new patch.
>---
> gnu/local.mk | 1 +
>gnu/packages/patches/libtasn1-CVE-2018-6003.patch | 73
>+++++++++++++++++++++++
> gnu/packages/tls.scm | 3 +-
> 3 files changed, 76 insertions(+), 1 deletion(-)
> create mode 100644 gnu/packages/patches/libtasn1-CVE-2018-6003.patch
>
>diff --git a/gnu/local.mk b/gnu/local.mk
>index eb968dede..9b32e5880 100644
>--- a/gnu/local.mk
>+++ b/gnu/local.mk
>@@ -852,6 +852,7 @@ dist_patch_DATA =
>\
> %D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch \
> %D%/packages/patches/libtar-CVE-2013-4420.patch \
> %D%/packages/patches/libtasn1-CVE-2017-10790.patch \
>+ %D%/packages/patches/libtasn1-CVE-2018-6003.patch \
> %D%/packages/patches/libtheora-config-guess.patch \
> %D%/packages/patches/libtiff-CVE-2016-10688.patch \
> %D%/packages/patches/libtiff-CVE-2017-9936.patch \
>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 000000000..3e6140518
>--- /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 <address@hidden>
>+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 <address@hidden>
>+---
>+ 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
>+
>diff --git a/gnu/packages/tls.scm b/gnu/packages/tls.scm
>index fa58f90cb..c2123add4 100644
>--- a/gnu/packages/tls.scm
>+++ b/gnu/packages/tls.scm
>@@ -91,7 +91,8 @@ specifications.")
> (inherit libtasn1)
> (source (origin
> (inherit (package-source libtasn1))
>- (patches (search-patches
>"libtasn1-CVE-2017-10790.patch"))))))
>+ (patches (search-patches "libtasn1-CVE-2017-10790.patch"
>+
>"libtasn1-CVE-2018-6003.patch"))))))
>
> (define-public asn1c
> (package
--
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