Vulnerability in libhtml-stripscripts-perl - Regular Expression Denial of Service
Summary
DSA-5339-1: libhtml-stripscripts-perl - security update. Affects libhtml-stripscripts-perl versions < 1.06-1+deb11u1. Fixed in 1.06-1+deb11u1. How to fix ↓
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Background
libhtml-stripscripts-perl is a Perl module that is used for removing scripts from HTML content. It provides a functionality to sanitize HTML by removing any script tags or inline script code. This module is commonly used in web applications to prevent cross-site scripting (XSS) attacks and ensure the security of user-generated content. However, a vulnerability has been discovered in libhtml-stripscripts-perl that can lead to a regular expression denial of service (ReDoS) attack. This vulnerability arises due to catastrophic backtracking when processing HTML content with specially crafted style attributes.
Vulnerability Detail
The vulnerability in libhtml-stripscripts-perl allows an attacker to exploit the regular expression engine's inefficient matching behavior and cause a denial of service by providing malicious input. By crafting HTML content with specially constructed style attributes, an attacker can trigger catastrophic backtracking, leading to excessive CPU and memory usage. This can result in a significant degradation of performance or even a complete system freeze. Successful exploitation of this vulnerability can disrupt the availability of the affected application or system. It is important to note that this vulnerability does not directly allow arbitrary code execution or unauthorized access to sensitive information.
How To Fix
Minimum fixed version
1.06-1+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libhtml-stripscripts-perlTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to apply the provided fix by upgrading the libhtml-stripscripts-perl package to the patched version.
Conclusion
The vulnerability in libhtml-stripscripts-perl can be mitigated by upgrading the package to the fixed version. It is recommended to promptly apply the provided fix to ensure the security and availability of the affected application or system. For further assistance or support in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for libhtml-stripscripts-perl →
FAQ
libhtml-stripscripts-perl is a Perl module used for removing scripts from HTML content. It helps sanitize HTML by removing any script tags or inline script code.
A regular expression denial of service (ReDoS) attack is a type of denial of service attack that exploits the inefficient matching behavior of regular expressions. By providing specially crafted input, an attacker can cause the regular expression engine to spend an excessive amount of time and resources, leading to a degradation of performance or system freeze.
The vulnerability in libhtml-stripscripts-perl can be exploited to cause a denial of service by triggering excessive CPU and memory usage. This can result in a significant degradation of performance or even a complete system freeze, impacting the availability of the affected application or system.
No, this vulnerability does not directly allow arbitrary code execution. It is a denial of service vulnerability that can disrupt the availability of the affected application or system.
No, there is no known workaround for this vulnerability. It is crucial to apply the provided fix by upgrading the libhtml-stripscripts-perl package to the patched version.
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