Heap-Based Buffer Overflow in libarchive: CVE-2016-4302 Vulnerability Overview
Summary
ALPINE-CVE-2016-4302: Heap-based buffer overflow in the parse_codes function in archive_read_support_format_rar.c in libarchive before 3.2.1 allows remote attackers to execute arbitrary code via a RAR file with a zero-sized dictionary. Affects libarchive versions < 3.2.1-r0. Fixed in 3.2.1-r0. How to fix ↓
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Background
libarchive is a widely used library that provides a flexible and efficient way to read and write various archive formats, including ZIP, TAR, and RAR. It is designed to support a wide range of file formats and offers features such as streaming and random access. However, a vulnerability was discovered in libarchive versions prior to 3.2.1, specifically in the parse_codes function within the archive_read_support_format_rar.c file, which could lead to severe security risks.
Vulnerability Detail
The vulnerability, identified as CVE-2016-4302, is a heap-based buffer overflow that occurs when processing a RAR file containing a zero-sized dictionary. This flaw allows remote attackers to exploit the vulnerability by crafting a malicious RAR file, potentially leading to arbitrary code execution on the affected system. The implications of this vulnerability are significant, as it could allow an attacker to gain unauthorized access, manipulate data, or disrupt services.
How To Fix
Minimum fixed version
3.2.1-r0
This is the first release that contains the fix.
sudo apk add --upgrade libarchiveTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid processing untrusted RAR files until the libarchive package is updated. Implement strict validation checks on the files being processed to minimize exposure to potential attacks.
Conclusion
The CVE-2016-4302 vulnerability in libarchive poses a significant risk due to its potential for arbitrary code execution. It is crucial to update to the patched version to ensure the security of your systems. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for libarchive →
FAQ
CVE-2016-4302 is a vulnerability in libarchive that allows for heap-based buffer overflow, potentially leading to arbitrary code execution.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which analyzes your manifest file for vulnerabilities.
Exploitation of this vulnerability can lead to unauthorized access, data manipulation, and service disruption.
Yes, the patch is available in libarchive version 3.2.1-r0 and later. Updating to this version will resolve the issue.
If immediate updating is not possible, avoid processing untrusted RAR files and implement validation checks on files being processed.
References
Related vulnerabilities
Recent vulnerabilities recorded for libarchive.
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