Libgcrypt Vulnerability: Weak Random Number Generation
Summary
ALPINE-CVE-2016-6313: The mixing functions in the random number generator in Libgcrypt before 1.5.6, 1.6.x before 1.6.6, and 1.7.x before 1.7.3 and GnuPG before 1.4.21 make it easier for attackers to obtain the values of 160 bits by leveragin... Affects libgcrypt versions < 1.7.0-r1. Fixed in 1.7.0-r1. How to fix ↓
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Background
Libgcrypt is a cryptographic library that provides a wide range of cryptographic functions, including encryption, decryption, and secure random number generation. It is widely used in various applications, including GnuPG, to ensure data security. However, certain versions of Libgcrypt are vulnerable to a weakness in their random number generator, which can compromise the security of cryptographic operations.
Vulnerability Detail
The vulnerability identified as CVE-2016-6313 affects Libgcrypt versions prior to 1.5.6, 1.6.x before 1.6.6, and 1.7.x before 1.7.3. The issue lies in the mixing functions of the random number generator, which can allow attackers to predict the output of the generator. By leveraging knowledge of previously generated bits, an attacker could potentially obtain the values of 160 bits, undermining the security of cryptographic operations that rely on secure random number generation. This vulnerability poses a significant risk, particularly in applications that depend on the integrity of cryptographic keys and secure communications.
How To Fix
Minimum fixed version
1.7.0-r1
This is the first release that contains the fix.
sudo apk add --upgrade libgcryptTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate upgrading is not feasible, consider implementing additional layers of security, such as using alternative cryptographic libraries or mechanisms that do not rely on the vulnerable random number generator until the update can be applied.
Conclusion
The vulnerability in Libgcrypt's random number generator poses a significant risk to applications relying on secure cryptographic functions. It is crucial to update to the patched version to mitigate this risk. Users are encouraged to monitor their applications for vulnerabilities using tools like Vulert, which can alert in real-time for open-source vulnerabilities.
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FAQ
CVE-2016-6313 is a vulnerability in Libgcrypt that affects its random number generator, allowing attackers to predict generated values.
Libgcrypt versions before 1.5.6, 1.6.x before 1.6.6, and 1.7.x before 1.7.3 are vulnerable.
Attackers could potentially predict cryptographic keys, compromising the security of encrypted data and communications.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for CVE-2016-6313 is 5.3, indicating a moderate level of severity.
References
Related vulnerabilities
Recent vulnerabilities recorded for libgcrypt.
