CVE-2008-1372 in bzip2
Summary
by MITRE
bzlib.c in bzip2 before 1.0.5 allows user-assisted remote attackers to cause a denial of service (crash) via a crafted file that triggers a buffer over-read, as demonstrated by the PROTOS GENOME test suite for Archive Formats.
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Analysis
by VulDB Data Team • 12/30/2024
The vulnerability identified as CVE-2008-1372 represents a critical buffer over-read flaw in the bzlib.c component of bzip2 compression utility versions prior to 1.0.5. This issue arises from insufficient input validation and boundary checking within the decompression logic, creating a scenario where maliciously crafted archive files can trigger unexpected memory access patterns. The vulnerability specifically affects the bzip2 compression library which is widely used across various operating systems and applications for handling compressed data, making it a significant concern for system security. The flaw enables attackers to manipulate the decompression process through carefully constructed input files that cause the decompressor to read beyond allocated memory boundaries, leading to program termination and system instability.
The technical implementation of this vulnerability stems from improper handling of compressed data structures during the decompression phase. When bzip2 processes malformed input files, the decompression algorithm fails to properly validate the bounds of data structures, particularly in the way it manages block headers and data streams. This allows an attacker to craft archive files that contain specially formatted data sequences which cause the decompressor to access memory locations beyond the intended buffer limits. The vulnerability operates at the level of the bzip2 library itself rather than at the application layer, meaning that any software relying on bzip2 for decompression is potentially affected regardless of the specific implementation. The buffer over-read condition manifests as a segmentation fault or access violation when the decompressor attempts to read data from memory locations that have not been properly allocated or are outside the expected data boundaries.
The operational impact of CVE-2008-1372 extends beyond simple denial of service to potentially compromise system stability and availability across multiple platforms. Since bzip2 is a fundamental component in many Unix-like systems, Linux distributions, and various network services, exploitation can lead to cascading failures in systems that depend on compressed data processing. The vulnerability is particularly dangerous in networked environments where automated decompression occurs, such as in web servers processing uploaded files, email servers handling compressed attachments, or network appliances managing compressed data streams. Attackers can leverage this flaw to create persistent denial of service conditions that may require system restarts or manual intervention to resolve, effectively disrupting legitimate service operations and potentially providing opportunities for more sophisticated attacks. The vulnerability affects both local and remote exploitation scenarios, with the remote aspect being particularly concerning given the widespread use of bzip2 in network protocols and file transfer systems.
Mitigation strategies for CVE-2008-1372 primarily focus on upgrading to bzip2 version 1.0.5 or later, which contains the necessary patches to address the buffer over-read condition. System administrators should prioritize patching all systems running vulnerable versions of bzip2, particularly those handling untrusted input or serving network services. Additional protective measures include implementing input validation for compressed files, deploying network monitoring to detect suspicious decompression activities, and configuring systems to limit decompression operations on untrusted data sources. The vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and represents a classic example of memory safety issues that fall under the ATT&CK technique of privilege escalation through software exploitation. Organizations should also consider implementing sandboxing mechanisms for decompression operations and establishing regular vulnerability assessment procedures to identify and remediate similar issues in other compression libraries and software components that may be similarly affected by buffer over-read conditions.