FreeBSD ffs_rdextattr() integer overflow

freebsd-ffsrdextattr-overflow (30144)

High Risk

Description:

FreeBSD is vulnerable to an integer overflow, caused by improper bounds checking by the ffs_rdextattr() function. By mounting a specially-crafted UFS file system with an invalid size parameter, a local attacker could exploit this vulnerability to cause the kernel to crash or possibly cause a heap-based buffer overflow and execute arbitrary code on the system.

*CVSS:

Base Score:	7
Access Vector:	Local
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	Complete
Integrity Impact:	Complete
Availability Impact:	Complete
Temporal Score:	6
Exploitability:	Proof-Of-Concept
Remediation Level:	Unavailable
Report Confidence:	Uncorroborated

Consequences:

Gain Privileges

Remedy:

No remedy available as of July 9, 2011.

References:

• FreeBSD Web site: The FreeBSD Project.
• MOKB-08-11-2006: FreeBSD 6.1 UFS filesystem ffs_rdextattr() integer overflow.
• CVE-2006-5824: Integer overflow in the ffs_rdextattr function in FreeBSD 6.1 allows local users to cause a denial of service (kernel panic) and trigger a heap-based buffer overflow via a crafted UFS filesystem, a different vulnerability than CVE-2006-5679. NOTE: a third party states that this issue does not cross privilege boundaries in FreeBSD because only root may mount a filesystem.

Platforms Affected:

• FreeBSD FreeBSD 6.1

Reported:

Nov 08, 2006

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For corrections or additions please email xforce@iss.net

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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