CVE-2003-0298 in Mozilla
Summary
by MITRE
The IMAP Client for Mozilla 1.3 and 1.4a allows remote malicious IMAP servers to cause a denial of service and possibly execute arbitrary code via certain large (1) literal and possibly (2) mailbox size values that cause either integer signedness errors or integer overflow errors.
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Analysis
by VulDB Data Team • 01/31/2018
The vulnerability identified as CVE-2003-0298 represents a critical security flaw in the IMAP client implementation within Mozilla versions 1.3 and 1.4a. This issue stems from insufficient input validation mechanisms that fail to properly handle large data values during IMAP protocol communication, creating exploitable conditions that can lead to both denial of service and potential remote code execution. The vulnerability specifically manifests when the client encounters certain large literal values and mailbox size parameters that trigger mathematical errors in the underlying integer handling mechanisms.
The technical root cause of this vulnerability lies in improper integer overflow and signedness handling within the IMAP client's parsing logic. When processing large literal values or mailbox size indicators from remote IMAP servers, the client's integer arithmetic operations fail to properly validate input boundaries, leading to situations where signed integers become unsigned or overflow beyond their allocated memory space. This class of vulnerability maps directly to CWE-190, which specifically addresses integer overflow conditions, and CWE-191, which covers integer underflow scenarios. The flaw demonstrates a classic buffer manipulation issue where the client fails to implement proper bounds checking on user-supplied data before processing.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable remote code execution on affected systems. An attacker controlling a malicious IMAP server can craft specially formatted responses that exploit the integer overflow conditions to overwrite memory locations, potentially allowing arbitrary code execution with the privileges of the affected user. The denial of service aspect occurs when the integer errors cause the application to crash or become unresponsive, while the execution component leverages the overflow to manipulate program control flow. This vulnerability affects the core email client functionality and represents a significant risk to users who may unknowingly connect to compromised IMAP servers.
Mitigation strategies for this vulnerability require immediate patching of affected Mozilla installations to version 1.4b or later, which contain the necessary fixes for integer overflow handling in IMAP client operations. Organizations should also implement network-level restrictions to prevent access to untrusted IMAP servers and consider configuring email clients to disable automatic downloading of large message content. Security monitoring should focus on detecting unusual IMAP server responses and network traffic patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of robust input validation and integer handling in client applications, aligning with ATT&CK technique T1190 for exploitation through client-side attacks and T1059 for command execution through compromised email clients. System administrators should also consider implementing email gateway filtering to prevent potentially malicious IMAP responses from reaching client systems.