CVE-2012-0212 in devscripts
Summary
by MITRE
debdiff.pl in devscripts 2.10.x before 2.10.69 and 2.11.x before 2.11.4 allows remote attackers to execute arbitrary code via shell metacharacters in the file name argument.
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Analysis
by VulDB Data Team • 12/04/2021
The vulnerability identified as CVE-2012-0212 affects the debdiff.pl script within the devscripts package, specifically impacting versions 2.10.x prior to 2.10.69 and 2.11.x prior to 2.11.4. This represents a critical command injection flaw that enables remote attackers to execute arbitrary code on systems where the affected software is installed. The vulnerability stems from insufficient input validation and sanitization within the script's handling of file name arguments, creating an environment where maliciously crafted input can be interpreted as shell commands rather than simple file references.
The technical flaw manifests through improper shell command construction in the debdiff.pl script where user-supplied file name arguments are directly incorporated into shell execution contexts without adequate sanitization or escaping. When an attacker provides a file name containing shell metacharacters such as semicolons, ampersands, or backticks, these characters are interpreted by the underlying shell as command delimiters or operators rather than literal filename characters. This allows attackers to inject additional commands that execute with the privileges of the user running the debdiff.pl script, typically a system administrator or automated build process. The vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and represents a classic command injection attack vector.
The operational impact of this vulnerability extends beyond simple code execution to potentially compromise entire development environments and build systems. Systems utilizing devscripts for package management and Debian package comparison operations become vulnerable to remote code execution attacks, enabling attackers to gain unauthorized access to development servers, modify package contents, or escalate privileges within the system. The attack surface is particularly concerning in automated build environments where debdiff.pl might be invoked programmatically without proper input validation, making the vulnerability exploitable through various attack vectors including web interfaces, automated scripts, or direct network-based exploitation. This vulnerability directly maps to ATT&CK technique T1059.001 for command and scripting interpreter, specifically shell scripting, and T1068 for exploit for privilege escalation.
Mitigation strategies for CVE-2012-0212 require immediate patching of affected devscripts versions to 2.10.69 or 2.11.4 respectively, which contain proper input sanitization and shell escaping mechanisms. Organizations should also implement additional defensive measures including restricting execution privileges of the debdiff.pl script, implementing input validation layers before any file name processing, and monitoring for suspicious command execution patterns. Network segmentation and access controls should be enforced to limit exposure of systems running vulnerable versions, while security teams should conduct comprehensive audits of all automated build and package management processes to identify potential attack vectors. The remediation process should also include updating monitoring systems to detect anomalous command execution patterns that may indicate exploitation attempts, ensuring that any future vulnerabilities in similar scripts are identified and addressed through proper code review and security testing protocols.