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>> Linux Kernel "keyctl_join_session_keyring()" Denial of Service Vulnerability

Title : Linux Kernel "keyctl_join_session_keyring()" Denial of Service Vulnerability
VUPEN ID : VUPEN/ADV-2009-0173
CVE ID : CVE-2009-0031
CWE ID : VUPEN VNS Only
CVSS V2 : VUPEN VNS Only
Rated as : Low Risk 
Remotely Exploitable : No
Locally Exploitable : Yes
Release Date : 2009-01-20


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format 

A vulnerability has been identified in Linux Kernel, which could be exploited by local attackers to cause a denial of service. This issue is caused due to a missing "kfree()" in the "keyctl_join_session_keyring()" [security/keys/keyctl.c] function, which could allow malicious users to exhaust all available memory resources, creating a denial of service condition.

Affected Products

Linux Kernel 2.6.x

Solution

A fix is available via GIT :
http://git2.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0d54ee1c7850a954026deec4cd4885f331da35cc

References

http://www.vupen.com/english/advisories/2009/0173
http://permalink.gmane.org/gmane.comp.security.oss.general/1394
http://git2.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0d54ee1c7850a954026deec4cd4885f331da35cc

Credits

Vulnerability reported by the vendor.

ChangeLog

2009-01-20 : Initial release

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