FreeBSD General Protection Fault privilege escalation

freebsd-fault-privilege-escalation (44905) The risk level is classified as HighHigh Risk

Description:

FreeBSD, when running on a 64bit system with a FreeBSD/amd64 kernel, could allow a local attacker to gain elevated privileges on the system. By causing a General Protection Fault while the kernel is returning from processing an interrupt or system call, a local attacker could cause the incorrect execution of swapgs CPU instruction. An attacker could exploit this vulnerability to execute arbitrary code on the system with kernel level privileges.

*CVSS:

Base Score: 6.9
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 5.1
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Refer to FreeBSD-SA-08:07.amd64 for patch, upgrade or suggested workaround information. See References.

References:

  • FreeBSD Web site: The FreeBSD Project.
  • FreeBSD-SA-08:07.amd64: amd64 swapgs local privilege escalation .
  • BID-31003: FreeBSD/amd64 'swapgs' Local Privilege Escalation Vulnerability
  • CVE-2008-3890: The kernel in FreeBSD 6.3 through 7.0 on amd64 platforms can make an extra swapgs call after a General Protection Fault (GPF), which allows local users to gain privileges by triggering a GPF during the kernel's return from (1) an interrupt, (2) a trap, or (3) a system call.
  • OSVDB ID: 47918: FreeBSD AMD64 swapgs Instruction General Protection Fault Local Privilege Escalation
  • SA31743: FreeBSD AMD64 General Protection Fault Privilege Escalation
  • SECTRACK ID: 1020815: FreeBSD Kernel amd64 swapgs Bug Lets Local Users Gain Elevated Privileges

Platforms Affected:

  • FreeBSD FreeBSD 6.3
  • FreeBSD FreeBSD 6.4
  • FreeBSD FreeBSD 7.0

Reported:

Sep 03, 2008

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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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