Moderate Vulnerability in Expat Package: Improper XML Entity Expansion Depth
Summary
RLSA-2025:3531: Moderate: expat security update. Affects expat versions < 0:2.5.0-3.el9_5.3. Fixed in 0:2.5.0-3.el9_5.3. How to fix ↓
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Background
Expat is a widely used C library designed for parsing XML documents. It is known for its efficiency and ease of use, making it a popular choice among developers for XML processing tasks. However, it has recently been identified as vulnerable to an issue that can lead to improper restriction of XML entity expansion depth, potentially allowing attackers to exploit this weakness.
Vulnerability Detail
The vulnerability, identified as CVE-2024-8176, arises from an improper restriction of XML entity expansion depth in the Expat library. This flaw can be exploited by attackers to create XML documents that cause excessive resource consumption, leading to denial of service (DoS) conditions. The severity of this vulnerability is rated with a CVSS score of 7.5, indicating a moderate risk to systems utilizing the affected version of Expat.
How To Fix
Minimum fixed version
0:2.5.0-3.el9_5.3
This is the first release that contains the fix.
sudo dnf update expatTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the available update as mentioned in the 'how_to_fix' section.
Conclusion
The Expat library has a moderate vulnerability (CVE-2024-8176) that can lead to denial of service due to improper XML entity expansion depth. Users are strongly encouraged to update to the patched version to secure their systems against potential exploitation.
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FAQ
CVE-2024-8176 is a vulnerability in the Expat library that allows for improper restriction of XML entity expansion depth, potentially leading to denial of service.
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 CVSS score for this vulnerability is 7.5, indicating a moderate level of risk.
The primary impact is the potential for denial of service attacks, where an attacker could exploit the vulnerability to exhaust system resources.
While there are no specific workarounds, it is advisable to monitor your systems closely and apply the update as soon as possible to mitigate risks.
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