Critical Buffer Overflow Vulnerability in Cracklib Package
Summary
ALPINE-CVE-2016-6318: Stack-based buffer overflow in the FascistGecosUser function in lib/fascist.c in cracklib allows local users to cause a denial of service (application crash) or gain privileges via a long GECOS field, involving longbuffe... Affects cracklib versions < 2.9.7-r0. Fixed in 2.9.7-r0. How to fix ↓
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Background
Cracklib is a library designed to check the strength of passwords by analyzing them against a set of rules. It is widely used in various applications to enhance security by ensuring that passwords meet certain complexity requirements. However, a critical vulnerability has been identified in Cracklib that could allow local users to exploit the system, potentially leading to unauthorized access or denial of service.
Vulnerability Detail
The vulnerability, identified as CVE-2016-6318, is a stack-based buffer overflow in the FascistGecosUser function located in lib/fascist.c of the Cracklib library. This flaw arises from improper handling of the GECOS field, which can be exploited by local users to cause an application crash or escalate privileges. The vulnerability has a CVSS score of 7.8, indicating a high severity level, and poses significant risks to systems utilizing this library.
How To Fix
Minimum fixed version
2.9.7-r0
This is the first release that contains the fix.
sudo apk add --upgrade cracklibTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can limit access to the affected application or restrict the usage of the GECOS field until the package is updated. Additionally, consider implementing stricter input validation to mitigate the risk of exploitation.
Conclusion
The Cracklib package has a critical vulnerability (CVE-2016-6318) that can lead to severe security risks. It is crucial to update to the patched version 2.9.7-r0 to mitigate these risks. Users should also consider implementing workarounds until the update can be applied.
See every vulnerability recorded for cracklib →
FAQ
CVE-2016-6318 is a vulnerability in the Cracklib library that allows local users to exploit a buffer overflow, potentially leading to application crashes or privilege escalation.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
The CVSS score for CVE-2016-6318 is 7.8, indicating a high severity level.
If an immediate update is not possible, consider restricting access to the affected application and validating inputs to reduce the risk of exploitation.
You can visit Vulert.com, which provides real-time monitoring and alerts for open-source vulnerabilities without requiring code access or installation.
References
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