PT-2009-3781 · Apple · Xnu+1

Mu-B · Published 2009-04-02 · Updated 2017-09-29 · CVE-2009-1238

Positive Technologies (AI Summary)

CVSS v2.0

7.2

High

Base vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions XNU versions 1228.8.20 and earlier Mac OS X versions 10.5.6 and earlier

Description A race condition exists in the HFS vfs sysctl interface, allowing local users to cause a denial of service by executing the same HFS SET PKG EXTENSIONS code path in multiple threads simultaneously. This issue arises due to the lack of mutex locking for a global variable.

Recommendations For XNU versions 1228.8.20 and earlier, consider applying a patch to implement mutex locking for the global variable to prevent simultaneous access. For Mac OS X versions 10.5.6 and earlier, update to a version that includes the fix for this issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2009-1238

Affected Products

Macos X

Xnu

References · 6

• 🔥 http://digit-labs.org/files/exploits/xnu-vfssysctl-dos.c · Exploit
• 🔥 http://securityfocus.com/bid/34202 · Exploit
• 🔥 https://exploit-db.com/exploits/8265 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2009-1238 · Security Note
• http://secunia.com/advisories/34424 · Note
• http://informationweek.com/news/hardware/mac/showArticle.jhtml?articleID=216401181 · Note