#VU42518 Input validation error in libvirt - CVE-2013-4154

Vulnerability identifier: #VU42518

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-2013-4154

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 remote 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 (NULL pointer dereference and crash) via vectors related to "agent based cpu (un)plug," as demonstrated by the "virsh vcpucount foobar --guest" command.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libvirt: 1.0.0 - 1.0.6

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External links
https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=96518d4316b711c72205117f8d5c967d5127bbb6
https://libvirt.org/news.html
https://openwall.com/lists/oss-security/2013/07/19/12
https://bugzilla.redhat.com/show_bug.cgi?id=984821
https://bugzilla.redhat.com/show_bug.cgi?id=986386

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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.