Bug 957106 (CVE-2015-7497) - VUL-1: CVE-2015-7497: libxml2: heap buffer overflow in xmlDictComputeFastQKey
Summary: VUL-1: CVE-2015-7497: libxml2: heap buffer overflow in xmlDictComputeFastQKey
Status: RESOLVED FIXED
Alias: CVE-2015-7497
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P4 - Low : Normal
Target Milestone: ---
Deadline: 2016-01-22
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/159190/
Whiteboard: CVSSv2:RedHat:CVE-2015-7497:4.3:(AV:N...
Keywords:
Depends on:
Blocks:
 
Reported: 2015-11-30 09:56 UTC by Alexander Bergmann
Modified: 2016-01-22 09:20 UTC (History)
2 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Alexander Bergmann 2015-11-30 09:56:09 UTC 
CVE-2015-7497 Avoid an heap buffer overflow in xmlDictComputeFastQKey

For https://bugzilla.gnome.org/show_bug.cgi?id=756528 It was possible to hit a negative offset in the name indexing used to randomize the dictionary key generation Reported and fix provided by David Drysdale @ Google

https://git.gnome.org/browse/libxml2/commit/?id=6360a31a84efe69d155ed96306b9a931a40beab9

diff --git a/dict.c b/dict.c
index 5f71d55..8c8f931 100644
--- a/dict.c
+++ b/dict.c
@@ -486,7 +486,10 @@ xmlDictComputeFastQKey(const xmlChar *prefix, int plen,
 	value += 30 * (*prefix);
 
     if (len > 10) {
-        value += name[len - (plen + 1 + 1)];
+        int offset = len - (plen + 1 + 1);
+	if (offset < 0)
+	    offset = len - (10 + 1);
+	value += name[offset];
         len = 10;
 	if (plen > 10)
 	    plen = 10;

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7497
http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-7497.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7497
https://bugzilla.gnome.org/show_bug.cgi?id=756528
Comment 1 SMASH SMASH 2015-11-30 12:17:27 UTC 
An update workflow for this issue was started.

This issue was rated as "moderate".
Please submit fixed packages until "Dec. 14, 2015".

When done, reassign the bug to "security-team@suse.de".
/update/121058/.
Comment 2 Swamp Workflow Management 2015-11-30 23:00:08 UTC 
bugbot adjusting priority
Comment 5 Bernhard Wiedemann 2015-12-17 14:01:16 UTC 
This is an autogenerated message for OBS integration:
This bug (957106) was mentioned in
https://build.opensuse.org/request/show/349390 13.2+13.1 / libxml2
Comment 7 Swamp Workflow Management 2015-12-27 00:14:28 UTC 
openSUSE-SU-2015:2372-1: An update that fixes 14 vulnerabilities is now available.

Category: security (moderate)
Bug References: 928193,951734,951735,954429,956018,956021,956260,957105,957106,957107,957109,957110
CVE References: CVE-2014-0191,CVE-2014-3660,CVE-2015-1819,CVE-2015-5312,CVE-2015-7497,CVE-2015-7498,CVE-2015-7499,CVE-2015-7500,CVE-2015-7941,CVE-2015-7942,CVE-2015-8035,CVE-2015-8241,CVE-2015-8242,CVE-2015-8317
Sources used:
openSUSE 13.2 (src):    libxml2-2.9.3-7.4.1, python-libxml2-2.9.3-7.4.1
openSUSE 13.1 (src):    libxml2-2.9.3-2.19.1, python-libxml2-2.9.3-2.19.1
Comment 8 Swamp Workflow Management 2016-01-05 14:26:33 UTC 
An update workflow for this issue was started.
This issue was rated as moderate.
Please submit fixed packages until 2016-01-19.
When done, reassign the bug to security-team@suse.de.
https://swamp.suse.de/webswamp/wf/62411
Comment 9 Swamp Workflow Management 2016-01-05 19:12:55 UTC 
SUSE-SU-2016:0030-1: An update that fixes 11 vulnerabilities is now available.

Category: security (moderate)
Bug References: 928193,951734,951735,956018,956021,956260,957105,957106,957107,957109,957110
CVE References: CVE-2015-1819,CVE-2015-5312,CVE-2015-7497,CVE-2015-7498,CVE-2015-7499,CVE-2015-7500,CVE-2015-7941,CVE-2015-7942,CVE-2015-8241,CVE-2015-8242,CVE-2015-8317
Sources used:
SUSE Linux Enterprise Software Development Kit 11-SP4 (src):    libxml2-2.7.6-0.34.1
SUSE Linux Enterprise Software Development Kit 11-SP3 (src):    libxml2-2.7.6-0.34.1
SUSE Linux Enterprise Server for VMWare 11-SP3 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Server 11-SP4 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Server 11-SP3 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Desktop 11-SP4 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Desktop 11-SP3 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
SUSE Linux Enterprise Debuginfo 11-SP3 (src):    libxml2-2.7.6-0.34.1, libxml2-python-2.7.6-0.34.4
Comment 10 Swamp Workflow Management 2016-01-07 16:14:20 UTC 
SUSE-SU-2016:0049-1: An update that fixes 12 vulnerabilities is now available.

Category: security (moderate)
Bug References: 928193,951734,951735,954429,956018,956021,956260,957105,957106,957107,957109,957110
CVE References: CVE-2015-1819,CVE-2015-5312,CVE-2015-7497,CVE-2015-7498,CVE-2015-7499,CVE-2015-7500,CVE-2015-7941,CVE-2015-7942,CVE-2015-8035,CVE-2015-8241,CVE-2015-8242,CVE-2015-8317
Sources used:
SUSE Linux Enterprise Software Development Kit 12-SP1 (src):    libxml2-2.9.1-13.1
SUSE Linux Enterprise Software Development Kit 12 (src):    libxml2-2.9.1-13.1
SUSE Linux Enterprise Server 12-SP1 (src):    libxml2-2.9.1-13.1, python-libxml2-2.9.1-13.1
SUSE Linux Enterprise Server 12 (src):    libxml2-2.9.1-13.1, python-libxml2-2.9.1-13.1
SUSE Linux Enterprise Desktop 12-SP1 (src):    libxml2-2.9.1-13.1, python-libxml2-2.9.1-13.1
SUSE Linux Enterprise Desktop 12 (src):    libxml2-2.9.1-13.1, python-libxml2-2.9.1-13.1
Comment 11 SMASH SMASH 2016-01-08 15:02:40 UTC 
An update workflow for this issue was started.

This issue was rated as "moderate".
Please submit fixed packages until "Jan. 22, 2016".

When done, reassign the bug to "security-team@suse.de".
/update/121235/.
Comment 12 SMASH SMASH 2016-01-08 15:07:26 UTC 
An update workflow for this issue was started.

This issue was rated as "moderate".
Please submit fixed packages until "Jan. 22, 2016".

When done, reassign the bug to "security-team@suse.de".
/update/62418/.
Comment 13 Swamp Workflow Management 2016-01-08 15:07:55 UTC 
An update workflow for this issue was started.
This issue was rated as moderate.
Please submit fixed packages until 2016-01-22.
When done, reassign the bug to security-team@suse.de.
https://swamp.suse.de/webswamp/wf/62418
Comment 14 Swamp Workflow Management 2016-01-13 17:13:56 UTC 
openSUSE-SU-2016:0106-1: An update that fixes 12 vulnerabilities is now available.

Category: security (moderate)
Bug References: 928193,951734,951735,954429,956018,956021,956260,957105,957106,957107,957109,957110
CVE References: CVE-2015-1819,CVE-2015-5312,CVE-2015-7497,CVE-2015-7498,CVE-2015-7499,CVE-2015-7500,CVE-2015-7941,CVE-2015-7942,CVE-2015-8035,CVE-2015-8241,CVE-2015-8242,CVE-2015-8317
Sources used:
openSUSE Leap 42.1 (src):    libxml2-2.9.1-10.1, python-libxml2-2.9.1-10.1
Comment 15 Andreas Stieger 2016-01-22 09:20:54 UTC 
All done, closing