Quantum Secular Labs / Blog / Advisories

CVE-2017-2640: Pidgin: Buffer overflow

CVE-2017-2640 is rated critical with a CVSS v3.0 base score of 9.8 and affects Pidgin, along with 6 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

An out-of-bounds write flaw was found in the way Pidgin before 2.12.0 processed XML content. A malicious remote server could potentially use this flaw to crash Pidgin or execute arbitrary code in the context of the pidgin process.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-787: Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Affected products

  • Pidgin: before 2.12.0
  • Debian Linux: 8.0
  • Red Hat Enterprise Linux Desktop: 7.0
  • Red Hat Enterprise Linux Server: 7.0
  • Red Hat Enterprise Linux Server Aus: 7.4
  • Red Hat Enterprise Linux Server Eus: 7.4; 7.5
  • Red Hat Enterprise Linux Workstation: 7.0

References