FreeBSD ktimer memory overwrite

freebsd-ktimer-memory-overwrite (49362)

Medium Risk

Description:

FreeBSD could allow a local attacker to overwrite kernel memory, caused by improper bounds checking by the ktimer integer. A local attacker could exploit this vulnerability to overwrite kernel memory addresses and possibly execute arbitrary code with ROOT privileges or cause a denial of service.

*CVSS:

Base Score:	3.6
Access Vector:	Local
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	2.7
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Gain Access

Remedy:

Refer to FreeBSD-SA-09:06.ktimer for patch, upgrade or suggested workaround information. See References.

References:

• FreeBSD-SA-09:06.ktimer : Local privilege escalation.
• BID-34196: FreeBSD 'ktimer' Local Privilege Escalation Vulnerability
• CVE-2009-1041: The ktimer feature (sys/kern/kern_time.c) in FreeBSD 7.0, 7.1, and 7.2 allows local users to overwrite arbitrary kernel memory via an out-of-bounds timer value.
• OSVDB ID: 53114: FreeBSD ktimer (sys/kern/kern_time.c) Arbitrary Kernel Memory Overwrite Local Privilege Escalation
• SECTRACK ID: 1021882: FreeBSD ktimer Input Validation Flaw Lets Local Users Gain Elevated Privileges

Platforms Affected:

• FreeBSD FreeBSD 7.0
• FreeBSD FreeBSD 7.1

Reported:

Mar 23, 2009

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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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