CVE-2010-0161 in Thunderbird
Summary
by MITRE
The nsAuthSSPI::Unwrap function in extensions/auth/nsAuthSSPI.cpp in Mozilla Thunderbird before 2.0.0.24 and SeaMonkey before 1.1.19 on Windows Vista, Windows Server 2008 R2, and Windows 7 allows remote SMTP, IMAP, and POP servers to cause a denial of service (heap memory corruption and application crash) or possibly execute arbitrary code via crafted data in a session that uses SSPI.
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Analysis
by VulDB Data Team • 05/03/2026
The vulnerability identified as CVE-2010-0161 represents a critical heap memory corruption flaw within the Security Support Provider Interface (SSPI) implementation of Mozilla Thunderbird and SeaMonkey email clients. This vulnerability specifically affects versions prior to 2.0.0.24 for Thunderbird and 1.1.19 for SeaMonkey when operating on Windows Vista, Windows Server 2008 R2, and Windows 7 operating systems. The flaw exists within the nsAuthSSPI::Unwrap function located in the extensions/auth/nsAuthSSPI.cpp source file, which handles authentication mechanisms using Windows SSPI for secure email protocols.
The technical exploitation of this vulnerability occurs when email clients process authentication responses from remote SMTP, IMAP, or POP servers that have been specifically crafted to trigger memory corruption. The nsAuthSSPI::Unwrap function fails to properly validate and sanitize input data received during the SSPI authentication process, leading to improper memory handling when processing maliciously constructed authentication tokens. This weakness creates opportunities for heap-based buffer overflows or memory corruption that can result in application crashes or potentially allow remote code execution. The vulnerability's impact is particularly severe on Windows operating systems that utilize SSPI for authentication, as these systems rely on the proper handling of authentication contexts and security tokens.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution attacks against vulnerable email clients. Attackers can craft malicious authentication responses that, when processed by the vulnerable Thunderbird or SeaMonkey applications, cause heap corruption leading to application instability or system compromise. This represents a significant threat to enterprise email environments where users may unknowingly connect to malicious email servers or encounter compromised email infrastructure. The vulnerability affects both email retrieval protocols (IMAP and POP) and email sending protocols (SMTP), making it particularly dangerous as users can be compromised regardless of their email activity type. The attack surface is broadened by the fact that these email clients are widely deployed in corporate and personal environments, increasing the potential for successful exploitation.
Mitigation strategies for CVE-2010-0161 primarily involve immediate software updates to patched versions of Mozilla Thunderbird and SeaMonkey, as these releases contain the necessary fixes to properly validate authentication data and prevent heap corruption. Organizations should also implement network-level controls to monitor and restrict connections to potentially malicious email servers, particularly when dealing with untrusted email sources. Security configurations should include disabling unnecessary authentication mechanisms and implementing strict input validation for all email protocol interactions. From a defensive perspective, this vulnerability aligns with CWE-121, heap-based buffer overflow, and represents a technique that could be categorized under ATT&CK tactic TA0001 (Initial Access) through malicious email servers and TA0002 (Execution) through potential remote code execution capabilities. Network segmentation and email filtering solutions should be enhanced to detect and block suspicious authentication responses that may indicate exploitation attempts.