CVE-2003-0128 in Evolution
Summary
by MITRE
The try_uudecoding function in mail-format.c for Ximian Evolution Mail User Agent 1.2.2 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a malicious uuencoded (UUE) header, possibly triggering a heap-based buffer overflow.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability identified as CVE-2003-0128 represents a critical security flaw in the Ximian Evolution Mail User Agent version 1.2.2 and earlier releases. This issue resides within the try_uudecoding function located in the mail-format.c source file, which processes uuencoded email attachments. The flaw manifests when the mail client encounters a maliciously crafted uuencoded header structure that it attempts to process during email parsing operations. Such malicious inputs can originate from untrusted email sources and are particularly dangerous because they exploit the client's handling of encoded data without proper validation or bounds checking.
The technical implementation of this vulnerability stems from improper buffer management within the uudecoding routine. When the try_uudecoding function processes a malformed UUE header, it fails to adequately validate the length or structure of the input data before attempting to copy or manipulate it in memory. This deficiency creates a heap-based buffer overflow condition that can be exploited by remote attackers to either crash the application or potentially execute arbitrary code with the privileges of the user running the mail client. The heap overflow occurs because the function allocates memory based on assumptions about input size that are subsequently violated by maliciously constructed headers, leading to memory corruption that can be leveraged for code execution.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it presents a potential path for remote code execution within the context of the affected mail client. Attackers can craft specially formatted emails containing malicious UUE headers that, when processed by the vulnerable Evolution client, trigger the buffer overflow condition. This creates a significant risk for users who may unknowingly open malicious emails, particularly in environments where automatic email processing is enabled. The vulnerability affects not only individual users but also enterprise environments where Evolution might be deployed as a standard email client across multiple systems.
Mitigation strategies for CVE-2003-0128 should prioritize immediate patching of affected systems, with the release of Evolution 1.2.3 addressing this specific heap overflow issue. Organizations should implement email filtering mechanisms that scan for and quarantine suspicious uuencoded content before it reaches end users. Network administrators should also consider implementing email security appliances that can detect and block malformed UUE headers. From a defensive perspective, this vulnerability aligns with CWE-121 heap-based buffer overflow conditions and represents a classic example of improper input validation that violates the principle of least privilege. The ATT&CK framework categorizes this as a code execution technique through input validation flaws, with potential for privilege escalation if the mail client runs with elevated permissions. System administrators should also consider implementing application whitelisting policies to restrict execution of vulnerable mail client versions until proper patches are deployed across all affected systems.