#VU41014 Input validation error in libvirt - CVE-2013-4399

Vulnerability identifier: #VU41014

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-2013-4399

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: libvirt.org

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The remoteClientFreeFunc function in daemon/remote.c in libvirt before 1.1.3, when ACLs are used, does not set an identity, which causes event handler removal to be denied and remote attackers to cause a denial of service (use-after-free and crash) by registering an event handler and then closing the connection. <a href="http://cwe.mitre.org/data/definitions/416.html">CWE-416: Use After Free</a>

Mitigation
Install update from vendor's website.

Vulnerable software versions

libvirt: 0.0.1 - 1.1.2

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External links
https://libvirt.org/git/?p=libvirt.git;a=commit;h=8294aa0c1750dcb49d6345cd9bd97bf421580d8b
https://secunia.com/advisories/60895
https://security.gentoo.org/glsa/glsa-201412-04.xml
https://security.libvirt.org/2013/0013.html
https://www.securityfocus.com/bid/62972

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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.