Ubuntu Software Properties GPG security bypass

ubuntu-gpg-sec-bypass (78990) The risk level is classified as MediumMedium Risk

Description:

Ubuntu Software Properties could allow a remote attacker to bypass security restrictions, caused by an error when verifying the GPG keys. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to trick a user into installing arbitrary PPA GPG keys.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.2
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Apply the appropriate updates for your system. See References.

References:

  • Ubuntu Web site: Ubuntu.
  • Ubuntu Web site: Ubuntu.
  • BID-55736: Ubuntu Software Properties PPA GPG Keys Validation Security Bypass Vulnerability
  • CVE-2012-5356: The apt-add-repository tool in Ubuntu Software Properties 0.75.x before 0.75.10.3, 0.80.x before 0.80.9.2, 0.81.x before 0.81.13.5, 0.82.x before 0.82.7.3, and 0.92.x before 0.92.8 does not properly check PPA GPG keys imported from a keyserver, which allows remote attackers to install arbitrary package repository GPG keys via a man-in-the-middle (MITM) attack.

Platforms Affected:

  • Canonical Ubuntu Linux 10.04 LTS
  • Canonical Ubuntu Linux 11.04
  • Canonical Ubuntu Linux 11.10
  • Canonical Ubuntu Linux 12.04 LTS i386
  • Canonical Ubuntu Linux 12.04 LTS amd64

Reported:

Oct 01, 2012

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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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