Buffer overflow in Libxml2 - CVE-2015-7942
Published: November 18, 2015 / Updated: July 28, 2020
Vulnerability identifier: #VU32380
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-7942
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The xmlParseConditionalSections function in parser.c in libxml2 does not properly skip intermediary entities when it stops parsing invalid input, which allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted XML data, a different vulnerability than CVE-2015-7941.
Affected software
Libxml2
Amazon Linux AMI
Fedora
libxml2 (Alpine package)
mingw-libxml2
libxml2
Amazon Linux AMI
Fedora
libxml2 (Alpine package)
mingw-libxml2
libxml2
How to mitigate CVE-2015-7942
Install update from vendor's website.
libxml2 (Alpine package) - addressed in versions 2.9.1-r3, 2.9.1-r4
mingw-libxml2 - addressed in versions 2.9.3-1.el7, 2.9.3-1.fc22, 2.9.3-1.fc23
libxml2 - addressed in versions 2.9.3-1.fc22, 2.9.3-1.fc23
mingw-libxml2 - addressed in versions 2.9.3-1.el7, 2.9.3-1.fc22, 2.9.3-1.fc23
libxml2 - addressed in versions 2.9.3-1.fc22, 2.9.3-1.fc23
External References
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html
- http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177341.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177381.html
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00120.html
- http://lists.opensuse.org/opensuse-updates/2016-01/msg00031.html
- http://marc.info/?l=bugtraq&m=145382616617563&w=2
- http://rhn.redhat.com/errata/RHSA-2015-2549.html
- http://rhn.redhat.com/errata/RHSA-2015-2550.html
- http://rhn.redhat.com/errata/RHSA-2016-1089.html
- http://www.debian.org/security/2015/dsa-3430
- http://www.openwall.com/lists/oss-security/2015/10/22/5
- http://www.openwall.com/lists/oss-security/2015/10/22/8
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.securityfocus.com/bid/79507
- http://www.securitytracker.com/id/1034243
- http://www.ubuntu.com/usn/USN-2812-1
- http://xmlsoft.org/news.html
- https://bugzilla.gnome.org/show_bug.cgi?id=744980#c8
- https://bugzilla.gnome.org/show_bug.cgi?id=756456
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04944172
- https://security.gentoo.org/glsa/201701-37
- https://support.apple.com/HT206166
- https://support.apple.com/HT206167
- https://support.apple.com/HT206168
- https://support.apple.com/HT206169