CVE-2009-4013: Canonical Ubuntu Linux

Critical severity, CVSS 9.8. EPSS: 5.8% chance of exploitation in the next 30 days.

Multiple directory traversal vulnerabilities in Lintian 1.23.x through 1.23.28, 1.24.x through 1.24.2.1, and 2.x before 2.3.2 allow remote attackers to overwrite arbitrary files or obtain sensitive information via vectors involving (1) control field names, (2) control field values, and (3) control files of patch systems.

Affected products

• Canonical Ubuntu Linux: version 6.06 only; version 8.04 only; version 8.10 only; version 9.04 only; version 9.10 only
• Debian Debian Linux: version 4.0 only; version 5.0 only
• Debian Lintian: from 1.23.0, up to and including 1.23.28; from 1.24.0, up to and including 1.24.2.1; from 2.0.0, before 2.3.2 (fixed in 2.3.2)

Published 2010-02-02. Last modified 2026-06-16.