Vulnerability identifier: #VU44883

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-2691

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libpng
Universal components / Libraries / Libraries used by multiple products

Vendor: libpng

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The png_err function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 makes a function call using a NULL pointer argument instead of an empty-string argument, which allows remote attackers to cause a denial of service (application crash) via a crafted PNG image.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libpng: 1.5.0 - 1.5.3

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External links
http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng/libpng;a=commit;h=9dad5e37aef295b4ef8dea39392b652deebc9261
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063118.html
http://marc.info/?l=bugtraq&m=133951357207000&w=2
http://secunia.com/advisories/45046
http://secunia.com/advisories/45405
http://secunia.com/advisories/45492
http://secunia.com/advisories/49660
http://security.gentoo.org/glsa/glsa-201206-15.xml
http://support.apple.com/kb/HT5002
http://www.debian.org/security/2011/dsa-2287
http://www.libpng.org/pub/png/libpng.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:151
http://www.openwall.com/lists/oss-security/2011/07/13/2
http://www.securityfocus.com/bid/48660
http://bugzilla.redhat.com/show_bug.cgi?id=720608
http://exchange.xforce.ibmcloud.com/vulnerabilities/68537

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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.