Arbitrary Code Execution Vulnerability in python-gnupg Package
Summary
CVE-2014-1927: The shell_quote function in python-gnupg 0.3.5 does not properly quote strings, which allows context-dependent attackers to execute arbitrary code via shell metacharacters in unspecified vectors, as demonstrated using "$... Affects python-gnupg versions < 0.3.6-1. Fixed in 0.3.6-1. How to fix ↓
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Background
The python-gnupg package is a Python wrapper for GnuPG, allowing developers to integrate GnuPG functionalities into their applications. It provides features for encryption, decryption, signing, and verification of data. The package is widely used in applications requiring secure data handling. However, a vulnerability in the shell_quote function can lead to severe security risks, enabling attackers to execute arbitrary code through improperly quoted strings.
Vulnerability Detail
The shell_quote function in python-gnupg version 0.3.5 fails to properly quote strings, which can allow context-dependent attackers to execute arbitrary code via shell metacharacters. This vulnerability is particularly dangerous as it can be exploited using command-substitution sequences like '$('. The issue stems from an incomplete fix for a previous vulnerability (CVE-2013-7323), making it critical for users to address this flaw promptly to prevent potential exploitation.
How To Fix
Minimum fixed version
0.3.6-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-gnupgTip — 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 vulnerable shell_quote function in their applications. Instead, they can implement their own quoting mechanism or use alternative libraries that provide similar functionalities without the vulnerability.
Conclusion
The CVE-2014-1927 vulnerability in the python-gnupg package poses a significant risk due to improper string quoting, allowing for arbitrary code execution. Users are strongly advised to upgrade to the latest version to mitigate this risk. For those unable to upgrade immediately, implementing workarounds can provide temporary relief from potential exploitation.
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FAQ
CVE-2014-1927 is a security vulnerability in the python-gnupg package that allows attackers to execute arbitrary code due to improper string quoting in the shell_quote function.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By uploading your manifest file like package-lock.json, you can check if your application is affected by CVE-2014-1927.
If exploited, this vulnerability can lead to arbitrary code execution, allowing attackers to take control of the affected system, steal sensitive information, or disrupt services.
Yes, upgrading to python-gnupg version 0.3.6-1 or later resolves the vulnerability and is recommended for all users.
If an immediate upgrade is not possible, consider implementing a workaround by avoiding the use of the vulnerable shell_quote function and using alternative methods for string quoting.
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