CVE-2004-0353 in Anubis
Summary
by MITRE
Multiple buffer overflows in auth_ident() function in auth.c for GNU Anubis 3.6.0 through 3.6.2, 3.9.92 and 3.9.93 allow remote attackers to gain privileges via a long string.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2004-0353 represents a critical buffer overflow flaw within the GNU Anubis email encryption software suite. This issue affects versions 3.6.0 through 3.6.2 and 3.9.92 and 3.9.93, creating a significant security risk that could be exploited by remote attackers to escalate privileges. The vulnerability specifically resides in the auth_ident() function located within the auth.c source file, making it a core component of the authentication mechanism that handles user identification processes. The flaw manifests when the software processes authentication requests containing excessively long strings, leading to memory corruption that can be leveraged for malicious purposes.
The technical implementation of this buffer overflow stems from inadequate input validation within the auth_ident() function where user-provided identification strings are processed without proper bounds checking. When an attacker submits a string exceeding the allocated buffer size, the excess data overflows into adjacent memory regions, potentially overwriting critical program variables, return addresses, or other executable code. This vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent stack memory. The attack vector requires remote access to the affected system, making it particularly dangerous in networked environments where Anubis servers might be exposed to untrusted users or clients.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it could enable attackers to execute arbitrary code with the privileges of the Anubis service account. This scenario presents a severe risk to email security infrastructure since Anubis serves as a critical component in email encryption and authentication processes. The vulnerability affects systems where Anubis is deployed as a mail filter or gateway, potentially compromising the entire email communication pipeline. Attackers could exploit this flaw to gain unauthorized access to encrypted email communications, modify authentication processes, or establish persistent access points within the network. The implications are particularly concerning given that Anubis was widely used for secure email handling in enterprise and government environments where data confidentiality and integrity are paramount.
Mitigation strategies for CVE-2004-0353 should prioritize immediate patching of affected systems with the latest available versions of GNU Anubis that contain fixed implementations of the auth_ident() function. Organizations should implement network segmentation to limit exposure of Anubis servers to untrusted networks and employ input validation mechanisms to filter out unusually long authentication strings at network boundaries. The remediation process must include thorough testing of patched systems to ensure that the buffer overflow protection does not introduce new functionality issues or performance degradation in legitimate authentication processes. Additionally, system administrators should conduct comprehensive vulnerability assessments to identify all instances of affected Anubis versions within their infrastructure and establish monitoring procedures to detect potential exploitation attempts. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving privilege escalation and code injection, making it a critical target for defensive measures including process monitoring, memory protection mechanisms, and regular security audits of cryptographic software implementations.