FreeBSD kernel ptsname() information disclosure

freebsd-ptsname-information-disclosure (39667)

Low Risk

Description:

The FreeBSD kernel could allow a local attacker to obtain sensitive information, caused by the improper verification of a valid pty before the extraction of characters by the ptsname() function. By executing pt_chown, a local attacker with read access could exploit this vulnerability to obtain and modify ownership of a restricted pty.

*CVSS:

Base Score:	4.1
Access Vector:	Adjacent Network
Access Complexity:	Low
Authentication:	Single
Confidentiality Impact:	Partial
Integrity Impact:	Partial
Availability Impact:	None
Temporal Score:	3
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Obtain Information

Remedy:

Refer to FreeBSD-SA-08:01.pty for patch or upgrade information. See References.

References:

• FreeBSD-SA-08:01.pty : pty snooping.
• BID-27284: FreeBSD pty Handling Multiple Local Information Disclosure Vulnerabilities
• CVE-2008-0216: The ptsname function in FreeBSD 6.0 through 7.0-PRERELEASE does not properly verify that a certain portion of a device name is associated with a pty of a user who is calling the pt_chown function, which might allow local users to read data from the pty from another user.
• SA28498: FreeBSD pty Snooping Vulnerabilities
• SECTRACK ID: 1019191: FreeBSD pty May Disclose Information to Local Users

Platforms Affected:

• FreeBSD FreeBSD 6.0

Reported:

Jan 14, 2008

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For corrections or additions please email xforce@iss.net

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