FreeBSD kernel openpty() information disclosure

freebsd-openpty-information-disclosure (39665) The risk level is classified as LowLow Risk

Description:

The FreeBSD kernel could allow a local attacker to obtain sensitive information, caused by an implementation error in the openpty() function when the permissions are set for opened pseudo terminals. By executing a program that calls the openpty() function internally, a local attacker could exploit this vulnerability to read the text from the pseudo terminal opened by a non-root user and obtain sensitive information.

*CVSS:

Base Score: 2.1
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 1.6
  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-2008-0217: The script program in FreeBSD 5.0 through 7.0-PRERELEASE invokes openpty, which creates a pseudo-terminal with world-readable and world-writable permissions when it is not run as root, which allows local users to read data from the terminal of the user running script.
  • OSVDB ID: 40813: FreeBSD script openpty Information Disclosure
  • SA28498: FreeBSD pty Snooping Vulnerabilities
  • SECTRACK ID: 1019191: FreeBSD pty May Disclose Information to Local Users

Platforms Affected:

  • FreeBSD FreeBSD 5.0

Reported:

Jan 14, 2008

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