CVE-2001-0675 in The Bat
Summary
by MITRE
Rit Research Labs The Bat! 1.51 for Windows allows a remote attacker to cause a denial of service by sending an email to a user s account containing a carrage return <CR> that is not followed by a line feed <LF>.
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Analysis
by VulDB Data Team • 02/02/2025
The vulnerability described in CVE-2001-0675 represents a classic buffer manipulation issue affecting email client software. This flaw exists within The Bat! 1.51 email client developed by Rit Research Labs for Windows operating systems. The specific condition that triggers the vulnerability occurs when a remote attacker crafts and delivers an email message containing a carriage return character followed immediately by a null byte or other control sequence without the proper line feed termination. This improper sequence manipulation exploits a weakness in the email client's parsing logic that fails to properly handle malformed line endings in email headers or content.
The technical execution of this vulnerability demonstrates a fundamental flaw in input validation and string processing within the email client's message handling subsystem. When the client encounters the malformed carriage return sequence, it processes the input without proper boundary checking or sequence validation, leading to memory corruption or unexpected program state changes. This processing error results in the application becoming unresponsive or crashing entirely, effectively rendering the email client unavailable to the user. The vulnerability specifically targets the client's ability to parse and display email messages, making it a denial of service condition that impacts the application's core functionality rather than allowing for arbitrary code execution or data compromise.
From an operational perspective, this vulnerability creates significant security implications for users who may be targeted by malicious actors seeking to disrupt email communications. The remote nature of the attack means that users can be affected without any local interaction or specific user actions beyond receiving the malicious email. The impact extends beyond simple service disruption as users may lose access to their email accounts during the attack period, potentially interrupting critical business communications or personal correspondence. Security professionals should consider this vulnerability as part of broader email security assessments, particularly in environments where email clients are used for sensitive communications and where availability of email services is critical to operations.
The flaw aligns with CWE-129, which describes improper validation of length of input buffers, and represents a variant of improper input handling that can lead to buffer overflows or memory corruption. This vulnerability also maps to ATT&CK technique T1499.004, which covers network denial of service attacks targeting email services. Organizations should implement email filtering solutions that can detect and block malformed email sequences before they reach end-user clients, while also ensuring that email client software is updated to versions that properly handle malformed input sequences. The vulnerability underscores the importance of robust input validation and proper error handling in client applications, particularly those processing untrusted data from external sources. Users should be educated about the potential risks of receiving emails from unknown sources and the importance of keeping email client software updated to address known vulnerabilities.