CVE-2005-3862 in unalz
Summary
by MITRE
Buffer overflow in unalz before 0.53 allows remote attackers to execute arbitrary code via long file names in ALZ archives.
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Analysis
by VulDB Data Team • 12/24/2024
The vulnerability identified as CVE-2005-3862 represents a critical buffer overflow flaw within the unalz decompression utility version 0.52 and earlier. This issue specifically manifests when processing ALZ archives containing excessively long file names, creating a condition where attacker-controlled input can overwrite adjacent memory locations in the application's execution environment. The flaw exists in the handling of archive metadata during the decompression process, where the software fails to properly validate the length of file names before copying them into fixed-size buffers. This vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to overwrite stack memory and potentially control program execution flow.
The operational impact of this vulnerability extends beyond simple code execution, as it provides remote attackers with the capability to arbitrarily compromise systems that process ALZ archives. When an attacker crafts a malicious ALZ archive with an overly long file name, the unalz utility will attempt to store this name in a buffer that cannot accommodate the excessive length, leading to memory corruption. This memory corruption can result in the execution of arbitrary code with the privileges of the user running the unalz utility, potentially enabling full system compromise. The vulnerability is particularly concerning because it operates in a remote attack scenario, meaning attackers do not need physical access to the target system to exploit it, making it a significant threat vector in networked environments where archive processing occurs.
From an attack perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1203 for exploitation for client execution, as it allows for arbitrary code execution through the manipulation of archive processing. The flaw demonstrates poor input validation practices that are commonly exploited in software security breaches, particularly in utilities that handle untrusted data from external sources. The vulnerability affects systems where unalz is installed and used to process ALZ archives, which were commonly used in certain file distribution scenarios during the early 2000s. The exploitability of this vulnerability is enhanced by the fact that ALZ archives are often used in automated processing pipelines, making the impact more widespread than typical local privilege escalation scenarios.
Mitigation strategies for CVE-2005-3862 primarily focus on immediate software updates and input validation improvements. System administrators should upgrade to unalz version 0.53 or later, which includes proper bounds checking for file name lengths in ALZ archives. Additionally, implementing network-level restrictions on ALZ archive processing, such as content filtering and sandboxed execution environments, can reduce the attack surface. The vulnerability highlights the importance of proper buffer management and input validation in security-critical applications, particularly those handling untrusted data. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates and establish secure coding practices that prevent similar buffer overflow conditions in other software components. The remediation process should include thorough testing of updated software to ensure that the fix does not introduce regressions in legitimate archive processing functionality while maintaining the security improvements.