CVE-2008-2021 in Lhaplus
Summary
by MITRE
Heap-based buffer overflow in Lhaplus before 1.57 allows remote attackers to execute arbitrary code via a long comment field in a ZOO archive.
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Analysis
by VulDB Data Team • 09/23/2018
The vulnerability identified as CVE-2008-2021 represents a critical heap-based buffer overflow in the Lhaplus archiving utility version 1.56 and earlier. This flaw exists within the handling of comment fields within ZOO archive files, creating a remote code execution vector that can be exploited by malicious actors. The vulnerability specifically manifests when the software processes a comment field that exceeds the allocated buffer space, leading to memory corruption that can be leveraged to execute arbitrary code on the target system. The affected software operates by parsing archive files and storing comment data in heap memory, where insufficient bounds checking allows attackers to overwrite adjacent memory regions.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond the allocated buffer boundaries. This particular flaw demonstrates how improper input validation can create exploitable memory corruption scenarios, particularly in archive processing utilities that handle untrusted data from external sources. The vulnerability operates through a classic buffer overflow attack pattern where a maliciously crafted comment field exceeding the buffer capacity triggers memory corruption. The heap-based nature of the overflow means that the memory layout is more complex than stack-based equivalents, but the exploitation potential remains equally severe.
From an operational perspective, this vulnerability presents significant risk to systems that process ZOO archive files from untrusted sources. The remote attack vector means that adversaries can exploit this vulnerability without requiring local access to the target system, making it particularly dangerous in networked environments. Attackers can craft malicious ZOO archives containing overly long comment fields to trigger the buffer overflow, potentially gaining full control over the affected system. The impact extends beyond simple code execution to include potential privilege escalation, data theft, and system compromise, particularly when the affected software runs with elevated privileges. Systems utilizing Lhaplus for automated archive processing or those that accept user-uploaded archives are especially vulnerable to this attack.
Mitigation strategies for CVE-2008-2021 should focus on immediate software updates to version 1.57 or later, which contains the necessary patches to address the buffer overflow condition. Organizations should implement input validation measures that enforce strict limits on comment field lengths within archive files, regardless of software updates. Network segmentation and access controls should be implemented to limit exposure of systems running vulnerable versions of Lhaplus, particularly those that process external archive files. Security monitoring should include detection of suspicious archive file patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and bounds checking in archive processing utilities, aligning with ATT&CK technique T1059.007 for command and scripting interpreter execution through malicious archive processing. System administrators should also consider implementing sandboxing mechanisms for archive processing to contain potential exploitation attempts and reduce the impact of successful attacks.