CVE-2003-0302 in Eudora
Summary
by MITRE
The IMAP Client for Eudora 5.2.1 allows remote malicious IMAP servers to cause a denial of service and possibly execute arbitrary code via certain large literal size values that cause either integer signedness errors or integer overflow errors.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 01/21/2019
The vulnerability identified as CVE-2003-0302 affects the IMAP client component of Eudora version 5.2.1, representing a critical security flaw that enables remote attackers to compromise system integrity through carefully crafted IMAP server responses. This vulnerability exists within the client-side processing of IMAP literal size values, specifically targeting how the software handles data transfer operations between the email client and IMAP servers. The flaw manifests when the client encounters specially constructed literal size parameters that exceed normal processing boundaries, creating conditions that can lead to system instability or unauthorized code execution.
The technical root cause of this vulnerability stems from improper input validation and handling of integer values within the IMAP client implementation. When processing large literal size values, the software fails to properly validate the signedness of integer variables, creating potential for signedness errors that can result in unexpected behavior during memory allocation or data processing. Additionally, the vulnerability exhibits characteristics of integer overflow conditions where the client attempts to process literal sizes that exceed the maximum representable values for the target integer data types. This dual nature of the flaw means that attackers can exploit either signedness errors or integer overflow conditions depending on the specific implementation details of the affected system.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable arbitrary code execution on affected systems. When exploited, the vulnerability allows remote IMAP servers to cause the Eudora client to crash or behave unpredictably, disrupting email services and potentially providing attackers with opportunities to execute malicious code with the privileges of the affected user. The severity of this flaw is particularly concerning given that IMAP clients are frequently used for accessing sensitive corporate and personal email communications, making the potential attack surface quite broad.
Mitigation strategies for this vulnerability should prioritize immediate patching of the affected Eudora client software to address the integer handling flaws in the IMAP processing code. System administrators should implement network segmentation to limit access to potentially malicious IMAP servers and consider implementing email filtering solutions that can detect and block suspicious literal size parameters. The vulnerability aligns with CWE-190, which specifically addresses integer overflow and underflow conditions, and also relates to CWE-129, which covers improper validation of array indices and buffer bounds. From an attack framework perspective, this vulnerability would be categorized under the ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands on compromised systems through the email client. Organizations should also consider implementing network monitoring solutions to detect unusual IMAP traffic patterns that might indicate exploitation attempts, particularly focusing on literal size values that exceed normal operational parameters.