CVE-2007-3201 in WinPT
Summary
by MITRE
Visual truncation vulnerability in Windows Privacy Tray (WinPT) 1.2.0 allows user-assisted remote attackers to install a key listed under the wrong user ID, and possibly cause the user to encrypt a victim s correspondence with this attacker-supplied key, via a key ID composed of the attacker s user ID, space characters, an invalid WinPT message, additional space characters, and the victim s user ID.
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Analysis
by VulDB Data Team • 09/04/2018
The vulnerability described in CVE-2007-3201 represents a sophisticated visual truncation flaw within the Windows Privacy Tray component of the PGP encryption system. This issue specifically affects WinPT version 1.2.0 and demonstrates how seemingly minor user interface design decisions can create significant security risks. The vulnerability operates through a carefully crafted key ID manipulation technique that exploits the way the system displays cryptographic identifiers, creating a deceptive environment where users may inadvertently trust malicious keys.
The technical exploitation mechanism relies on the visual truncation behavior of the privacy tray interface where key IDs are displayed with insufficient width to accommodate full identifiers. Attackers can construct malicious key IDs that appear legitimate when truncated but contain embedded malicious components. The attack string consists of the attacker's user ID followed by space characters, an invalid WinPT message, additional space characters, and finally the victim's user ID. This construction exploits the truncation behavior to make the key appear to belong to the victim while actually containing the attacker's identity in the visible portion.
This vulnerability operates under the CWE-1276 category of security misconfiguration, specifically related to user interface security flaws that can mislead users into trusting malicious components. The attack pattern aligns with techniques described in the ATT&CK framework under the T1556 credential access tactic, where adversaries manipulate user interfaces to gain trust and subsequently compromise encryption systems. The flaw essentially creates a man-in-the-middle scenario within the encryption workflow where legitimate users may unknowingly encrypt communications with attacker-controlled keys.
The operational impact of this vulnerability extends beyond simple key misidentification, as it can lead to complete compromise of encrypted communications between the victim and other parties. When users trust what appears to be a legitimate key due to the truncation deception, they may encrypt sensitive correspondence with the attacker's key, allowing the attacker to decrypt and monitor communications. This creates a persistent security risk where the attacker can maintain access to communications long after the initial compromise, potentially affecting all encrypted messages sent between the victim and other trusted parties. The vulnerability also undermines the fundamental trust model of public key infrastructure systems, where users rely on visual identification to validate key authenticity.
Mitigation strategies for this vulnerability require both immediate system-level fixes and user education initiatives. System administrators should ensure that all affected versions of WinPT are updated to patched releases that address the visual truncation behavior. The fix must implement proper key ID display mechanisms that prevent truncation attacks by either using fixed-width displays or implementing proper truncation policies that maintain cryptographic integrity. Additionally, users should be educated about verifying key fingerprints through multiple channels and not relying solely on visual identification in privacy tray interfaces. Security policies should mandate that all key verification processes include cross-reference checks with trusted key servers and manual verification of key fingerprints. Organizations implementing PGP-based encryption systems should also consider deploying additional monitoring mechanisms to detect anomalous key usage patterns that might indicate successful exploitation of this vulnerability.