CVE-2001-0265 in PGP
Summary
by MITRE
ASCII Armor parser in Windows PGP 7.0.3 and earlier allows attackers to create files in arbitrary locations via a malformed ASCII armored file.
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability identified as CVE-2001-0265 represents a critical file system manipulation flaw within the ASCII Armor parser component of Windows PGP version 7.0.3 and earlier implementations. This security weakness resides in the cryptographic software's handling of ASCII armored files, which are commonly used to encode binary data for transmission through text-based channels. The vulnerability stems from insufficient input validation and path traversal protection mechanisms within the parser logic, allowing malicious actors to exploit the software's file creation behavior.
The technical flaw manifests when the vulnerable PGP implementation processes a specially crafted ASCII armored file that contains malformed path references or directory traversal sequences. The ASCII Armor format typically encloses binary data within ASCII text boundaries using specific markers and encoding schemes, but the parser in affected versions fails to properly sanitize or validate the file paths specified within these encoded structures. This deficiency enables attackers to manipulate the parser into creating files at arbitrary locations on the target system, potentially bypassing normal file system permissions and security boundaries.
From an operational impact perspective, this vulnerability presents significant risks to system security and integrity. Attackers can leverage this weakness to inject malicious files into critical system directories, potentially establishing persistent backdoors or corrupting system files. The ability to write files to arbitrary locations allows for privilege escalation scenarios where attackers might place malicious executables in system paths or modify existing legitimate files to redirect execution flow. This capability directly violates fundamental security principles of least privilege and file system isolation, enabling unauthorized system modifications that could compromise the entire platform.
The vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This classification emphasizes the core issue of inadequate input validation that allows attackers to manipulate file system operations beyond intended boundaries. From an adversarial perspective, this weakness maps to ATT&CK technique T1059.007 for command and scripting interpreter, where attackers might leverage file creation capabilities to establish persistent access through malicious script or executable placement. The vulnerability also connects to T1566 for credential access through social engineering, as attackers could manipulate file creation to intercept or modify authentication-related files.
Mitigation strategies for CVE-2001-0265 should prioritize immediate software updates to versions that address the path traversal vulnerability in the ASCII Armor parser. Organizations must implement comprehensive patch management protocols to ensure all affected Windows PGP installations are upgraded to secure versions. Additional protective measures include restricting file system permissions for PGP installation directories, implementing network-based controls to prevent processing of untrusted ASCII armored files, and deploying intrusion detection systems to monitor for suspicious file creation patterns. Security administrators should also consider implementing application whitelisting policies that restrict execution of PGP or related cryptographic tools to authorized users only, reducing the attack surface available to potential adversaries.