Buffer overflow in Libxml2

1) Buffer overflow

EUVDB-ID: #VU32380

Risk: Medium

CVSSv4.0: 2.7 [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/E:U/U:Green]

CVE-ID: CVE-2015-7942

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Libxml2: 6.0.19

CPE2.3

• cpe:2.3:a:gnome:libxml2:6.0.19:*:*:*:*:*:*:*

External links

https://lists.apple.com/archives/security-announce/2016/Mar/msg00000.html
https://lists.apple.com/archives/security-announce/2016/Mar/msg00001.html
https://lists.apple.com/archives/security-announce/2016/Mar/msg00002.html
https://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177341.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177381.html
https://lists.opensuse.org/opensuse-updates/2015-12/msg00120.html
https://lists.opensuse.org/opensuse-updates/2016-01/msg00031.html
https://marc.info/?l=bugtraq&m=145382616617563&w=2
https://rhn.redhat.com/errata/RHSA-2015-2549.html
https://rhn.redhat.com/errata/RHSA-2015-2550.html
https://rhn.redhat.com/errata/RHSA-2016-1089.html
https://www.debian.org/security/2015/dsa-3430
https://www.openwall.com/lists/oss-security/2015/10/22/5
https://www.openwall.com/lists/oss-security/2015/10/22/8
https://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www.securityfocus.com/bid/79507
https://www.securitytracker.com/id/1034243
https://www.ubuntu.com/usn/USN-2812-1
https://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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.