Emacspeak extract-table.pl symlink

emacspeak-extracttable-symlink (45237) The risk level is classified as MediumMedium Risk

Description:

Emacspeak could allow a local attacker to launch a symlink attack. The extract-table.pl script creates temporary files insecurely. A local attacker could exploit this vulnerability by creating a symbolic link from the extract-table.csv temporary file to other various files on the system, which would allow the attacker to overwrite arbitrary files on the system with elevated privileges.

*CVSS:

Base Score: 3.3
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 2.9
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

File Manipulation

Remedy:

Upgrade to the latest version of Emacspeak (28.0-2 or later), available from the Emacspeak Web page. See References.

References:

  • Debian Bug report logs - #496431: The possibility of attack with the help of symlinks in some Debian packages.
  • Dmitry E. Oboukhov Advisory: Package: emacspeak .
  • Emacspeak Web page: Emacspeak --The Complete Audio Desktop.
  • BID-31241: Emacspeak 'extract-table.pl' Insecure Temporary File Creation Vulnerability
  • CVE-2008-4191: extract-table.pl in Emacspeak 26 and 28 allows local users to overwrite arbitrary files via a symlink attack on the extract-table.csv temporary file.
  • OSVDB ID: 48267: Emacspeak extract-table.pl Temporary File Symlink Arbitrary File Overwrite
  • SA31880: emacspeak Insecure Temporary Files

Platforms Affected:

  • Emacspeak Emacspeak 26
  • Emacspeak Emacspeak 28

Reported:

Aug 24, 2008

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