#VU32389 Input validation error in Apache Tomcat - CVE-2015-7941
Vulnerability identifier: #VU32389
Vulnerability risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2015-7941
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Apache Tomcat
Server applications /
Web servers
Vendor: Apache Foundation
Description
The vulnerability allows context-dependent attackers to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (out-of-bounds read and libxml2 crash) via crafted XML data to the (1) xmlParseEntityDecl or (2) xmlParseConditionalSections function in parser.c, as demonstrated by non-terminated entities. "context dependent" seems to point to MiTM attack due to: If a user or automated system were tricked into opening a specially crafted document, an attacker could possibly cause libxml2 to crash, resulting in a denial of service.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Apache Tomcat: 6.0.19
External links
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/bulletinjan2016-2867206.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://www.securityfocus.com/bid/74241
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
https://git.gnome.org/browse/libxml2/commit/?id=9b8512337d14c8ddf662fcb98b0135f225a1c489
https://git.gnome.org/browse/libxml2/commit/?id=a7dfab7411cbf545f359dd3157e5df1eb0e7ce31
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04944172
https://security.gentoo.org/glsa/201701-37
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.
