Denial of Service Vulnerability in Python Packages: CVE-2018-1060
Summary
ALPINE-CVE-2018-1060: python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in pop3lib's apop() method. Affects python2 versions < 2.7.15-r0. Fixed in 2.7.15-r0. How to fix ↓
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Background
Python is a widely-used high-level programming language known for its readability and versatility. It supports multiple programming paradigms and is used in various applications, from web development to data analysis. The vulnerability identified as CVE-2018-1060 affects Python versions prior to 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1, and 3.7.0, specifically in the pop3lib's apop() method, which is used for handling authentication in the POP3 email protocol. This vulnerability can lead to denial of service attacks, making it crucial for users to address it promptly.
Vulnerability Detail
The vulnerability arises from catastrophic backtracking in the pop3lib's apop() method, which can be exploited by an attacker to cause a denial of service. This occurs when the method processes specially crafted input that leads to excessive resource consumption, potentially crashing the service. The flaw is significant as it can disrupt email services relying on the affected versions of Python, impacting users and organizations relying on these services for communication.
How To Fix
Minimum fixed version
2.7.15-r0
This is the first release that contains the fix.
sudo apk add --upgrade python2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can avoid using the pop3lib's apop() method until they can update to a patched version. Additionally, implementing input validation and limiting the size of input can help reduce the risk of denial of service attacks.
Conclusion
CVE-2018-1060 is a critical vulnerability in Python's pop3lib that can lead to denial of service attacks. Users are strongly encouraged to update their Python packages to the latest patched versions to mitigate this risk. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2018-1060 is a vulnerability in Python's pop3lib that can lead to denial of service due to catastrophic backtracking.
Affected versions include Python 2.7.15 and earlier, 3.4.9 and earlier, 3.5.6rc1, 3.6.5rc1, and 3.7.0.
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 of CVE-2018-1060 is 7.5, indicating a high severity level.
If immediate updates are not possible, consider implementing input validation and avoiding the use of the vulnerable method as a temporary measure.
References
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