CVE-2017-8844 in lrzip
Summary
by MITRE
The read_1g function in stream.c in liblrzip.so in lrzip 0.631 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted archive.
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Analysis
by VulDB Data Team • 12/06/2022
The vulnerability identified as CVE-2017-8844 represents a critical heap-based buffer overflow in the lrzip compression utility, specifically within the read_1g function located in stream.c of the liblrzip.so library version 0.631. This flaw exists in the handling of compressed archive files and provides remote attackers with the ability to trigger either a denial of service condition through application crashes or potentially execute arbitrary code with unspecified other impacts. The vulnerability stems from inadequate bounds checking during the processing of crafted archive files, allowing malicious input to overwrite adjacent heap memory regions. The affected component is part of the lrzip compression toolchain which is widely used for creating and extracting compressed archives, making this vulnerability particularly concerning for systems that process untrusted archive data. The heap-based nature of the overflow indicates that the vulnerability occurs when the program attempts to write data beyond the allocated memory boundaries of heap-allocated buffers, which can result in memory corruption and unpredictable behavior.
The technical implementation of this vulnerability involves the read_1g function's failure to properly validate input parameters when processing archive data structures. When a maliciously crafted archive is processed, the function attempts to read or write data beyond the intended buffer boundaries, leading to memory corruption that can cause the application to crash or potentially allow for more sophisticated exploitation techniques. This type of vulnerability falls under CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of improper input validation in memory management operations. The attack vector is particularly dangerous because it can be exploited remotely through the processing of malicious archive files, making it applicable to web applications, file sharing systems, or any service that handles compressed archive data. The vulnerability's impact extends beyond simple denial of service to potentially enable privilege escalation or code execution depending on the specific memory layout and system configuration.
The operational impact of CVE-2017-8844 is substantial across various deployment scenarios where lrzip is utilized for data compression and archiving operations. Systems that automatically process or decompress user-uploaded archives, such as web applications, file sharing platforms, email systems, or backup solutions, become vulnerable to remote exploitation. The vulnerability can be leveraged by attackers to disrupt services through repeated denial of service attacks or potentially gain unauthorized access to systems if the memory corruption leads to executable code injection. Organizations using lrzip for data processing pipelines, automated backup systems, or content distribution networks face significant risk as this vulnerability can be triggered through legitimate archive processing operations. The exploitation requires minimal privileges and can be automated, making it attractive to threat actors seeking to compromise systems. Furthermore, the vulnerability affects not just individual applications but entire ecosystems that depend on lrzip for compression functionality, potentially creating cascading failures across interconnected systems that process compressed data.
Mitigation strategies for CVE-2017-8844 should focus on immediate patching of affected lrzip installations to version 0.632 or later, which contains the necessary fixes for the buffer overflow vulnerability. System administrators should implement strict input validation and sanitization for all archive processing operations, particularly when handling untrusted data from external sources. Network segmentation and access controls should be enforced to limit the exposure of systems that process archive files, reducing the attack surface available to potential adversaries. Regular security auditing of compression utility usage and monitoring for unusual processing patterns can help detect exploitation attempts. Organizations should also consider implementing sandboxing techniques for archive processing operations to contain potential exploits within isolated environments. The remediation process should include comprehensive testing of patched systems to ensure that the vulnerability has been fully addressed without introducing regressions in functionality. Additionally, implementing automated vulnerability scanning and continuous monitoring for similar memory corruption vulnerabilities in other compression utilities can help prevent future incidents. Security teams should also review their incident response procedures to ensure preparedness for exploitation attempts targeting compression utilities, as these vulnerabilities often remain undetected for extended periods due to their indirect nature. The ATT&CK framework categorizes this vulnerability under T1059 for command and scripting interpreter and T1499 for endpoint denial of service, highlighting the multi-faceted nature of potential exploitation paths that security teams must consider when implementing protective measures.