Critical Buffer Overflow Vulnerability in Perl Package
Summary
ALPINE-CVE-2018-18314: Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations. Affects perl versions < 5.26.3-r0. Fixed in 5.26.3-r0. How to fix ↓
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Background
Perl is a high-level, general-purpose programming language known for its text processing capabilities and flexibility. It is widely used for web development, system administration, and network programming. The Perl package in Alpine Linux distributions is essential for running Perl scripts and applications. However, a critical vulnerability has been identified that affects multiple versions of this package, making it susceptible to buffer overflow attacks.
Vulnerability Detail
The vulnerability, identified as CVE-2018-18314, exists in Perl versions prior to 5.26.3. It is caused by a buffer overflow that can occur when processing crafted regular expressions, leading to invalid write operations. This flaw can potentially allow an attacker to execute arbitrary code, resulting in severe consequences such as data corruption, unauthorized access, or system crashes. The CVSS score for this vulnerability is 9.8, indicating a critical level of risk.
How To Fix
Minimum fixed version
5.26.3-r0
This is the first release that contains the fix.
sudo apk add --upgrade perlTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider restricting the use of Perl scripts that may process untrusted input until the package can be updated. Additionally, implementing input validation can help mitigate the risk of exploitation.
Conclusion
The buffer overflow vulnerability in the Perl package poses a critical risk to applications using affected versions. It is crucial to update to the patched version 5.26.3-r0 to mitigate this risk. Users should also consider using Vulert to monitor for vulnerabilities in their applications.
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FAQ
CVE-2018-18314 is a critical buffer overflow vulnerability found in Perl versions prior to 5.26.3, which can lead to arbitrary code execution.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The vulnerability can lead to data corruption, unauthorized access, and system crashes, posing significant risks to applications using affected Perl versions.
Yes, the patched version of Perl is 5.26.3-r0, which addresses the buffer overflow issue.
If you cannot update Perl right away, consider restricting the use of vulnerable scripts and implementing input validation to reduce the risk of exploitation.
References
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