Moderate: python-jinja2 security update
Summary
ALSA-2021:4161: Moderate: python-jinja2 security update. Affects python3-jinja2 versions < 2.10.1-3.el8. Fixed in 2.10.1-3.el8. How to fix ↓
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Background
The python-jinja2 package contains Jinja2, a template engine written in pure Python. Jinja2 provides a Django inspired non-XML syntax but supports inline expressions and an optional sandboxed environment.
Vulnerability Detail
The python-jinja2 package is affected by a Regular Expression Denial of Service (ReDoS) vulnerability, identified as CVE-2020-28493. This vulnerability is caused by a sub-pattern in the code, which can be exploited to cause a denial of service attack. An attacker can send a specially crafted input that triggers excessive backtracking in the regular expression engine, leading to high CPU usage and potentially causing the application to become unresponsive. The impact of this vulnerability can range from service degradation to a complete denial of service.
How To Fix
Minimum fixed version
2.10.1-3.el8
This is the first release that contains the fix.
sudo dnf update python3-jinja2Tip — 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 necessary to apply the security update to mitigate the risk.
Conclusion
The python-jinja2 package is affected by a ReDoS vulnerability, which can be exploited to cause a denial of service. To mitigate this risk, it is recommended to update the package to the latest version. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Python-jinja2 is a template engine written in pure Python. It provides a non-XML syntax inspired by Django and supports inline expressions and a sandboxed environment.
A Regular Expression Denial of Service (ReDoS) vulnerability occurs when a regular expression pattern can be exploited to cause excessive backtracking in the regular expression engine. This can lead to high CPU usage and potentially a denial of service.
The impact of this vulnerability can range from service degradation to a complete denial of service. An attacker can send a specially crafted input that triggers excessive backtracking, causing the application to become unresponsive.
To fix this vulnerability, update the python-jinja2 package to version 2.10.1-3.el8 or later. This update includes a patch that addresses the ReDoS vulnerability.
No, there is no known workaround for this vulnerability. It is necessary to apply the security update to mitigate the risk.
References
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