Vulnerability CVE-2009-1238
Published: 2009-04-02   Modified: 2012-02-13

Description:
Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10.5.6 and earlier allows local users to cause a denial of service (kernel memory corruption) by simultaneously executing the same HFS_SET_PKG_EXTENSIONS code path in multiple threads, which is problematic because of lack of mutex locking for an unspecified global variable.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Mac OS X xnu <=1228.x (vfssysctl) Local Kernel DoS PoC
mu-b
05.04.2009

Type:

CWE-362

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Apple -> Mac os x 
Apple -> Mac os x server 

 References:
http://www.securityfocus.com/bid/34202
http://www.milw0rm.com/exploits/8265
http://www.informationweek.com/news/hardware/mac/showArticle.jhtml?articleID=216401181
http://www.digit-labs.org/files/exploits/xnu-vfssysctl-dos.c
http://secunia.com/advisories/34424
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