#VU33122 Input validation error - CVE-2012-0840

Vulnerability identifier: #VU33122

Vulnerability risk: Medium

CVSSv4.0: 5.5 [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:P/U:Green]

CVE-ID: CVE-2012-0840

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Description

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

tables/apr_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Mitigation
Install update from vendor's website.

External links
https://mail-archives.apache.org/mod_mbox/apr-commits/201201.mbox/%3C20120115003715.071D423888FD@eris.apache.org%3E
https://openwall.com/lists/oss-security/2012/02/08/3
https://openwall.com/lists/oss-security/2012/02/09/1
https://secunia.com/advisories/47862
https://svn.apache.org/viewvc?rev=1231605&view=rev
https://www.mail-archive.com/dev%40apr.apache.org/msg24439.html
https://www.mail-archive.com/dev%40apr.apache.org/msg24472.html
https://www.mail-archive.com/dev%40apr.apache.org/msg24473.html
https://www.mandriva.com/security/advisories?name=MDVSA-2012:019
https://exchange.xforce.ibmcloud.com/vulnerabilities/73096

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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. However, proof of concept for this vulnerability is available.