NVClock set_default_speeds() function symlink

nvclock-setdefaultspeeds-symlink (35584)

Medium Risk

Description:

NVClock could allow a local attacker to launch a symlink attack. The set_default_speeds() function in src/backend/backend.c creates temporary files insecurely. A local attacker could exploit this vulnerability by creating a symbolic link from a temporary file to other files on the system, which would allow the attacker to execute arbitrary code on the vulnerable system with root prvileges.

*CVSS:

Base Score:	2.9
Access Vector:	Local
Access Complexity:	High
Authentication:	Not Required
Confidentiality Impact:	None
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	2.4
Exploitability:	High
Remediation Level:	Official-Fix
Report Confidence:	Uncorroborated

Consequences:

File Manipulation

Remedy:

Upgrade to the latest version of NVClock (0.8b2 or later), available from the LinuxHardware Web site. See References.

References:

• LinuxHardware Web site: NVClock.
• BID-25052: NVClock Local Privilege Escalation Vulnerability
• CVE-2007-3531: The set_default_speeds function in backend/backend.c in NVidia NVClock before 0.8b2 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/nvclock temporary file.
• GLSA-200707-08: NVClock: Insecure file usage
• SA26208: NVClock "set_default_speeds()" Insecure Temporary Files

Platforms Affected:

• Gentoo Linux
• Gentoo nvclock 0.7 and prior

Reported:

Jul 24, 2007

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