Predictable Random Value Vulnerability in Samba Package
Summary
ALPINE-CVE-2022-1615: In Samba, GnuTLS gnutls_rnd() can fail and give predictable random values. Affects samba versions < 4.17.0-r0. Fixed in 4.17.0-r0. How to fix ↓
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Background
Samba is an open-source software suite that provides seamless file and print services to SMB/CIFS clients. It enables interoperability between Linux/Unix servers and Windows-based clients. Samba is widely used for sharing files and printers across different operating systems. However, it has been found to have a vulnerability related to the GnuTLS library, which can lead to predictable random values being generated, potentially compromising security.
Vulnerability Detail
In Samba, the function gnutls_rnd() can fail, resulting in the generation of predictable random values. This vulnerability can be exploited by attackers to predict cryptographic keys or other sensitive information, leading to unauthorized access or data breaches. The issue originates from the way random number generation is handled in the GnuTLS library, which Samba relies on for secure communications. The severity of this vulnerability is reflected in its CVSS score of 5.5, indicating a moderate risk to affected systems.
How To Fix
Minimum fixed version
4.17.0-r0
This is the first release that contains the fix.
sudo apk add --upgrade sambaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not possible, consider implementing additional security measures such as restricting access to Samba shares or using firewalls to limit exposure. However, these are temporary solutions and do not address the root cause of the vulnerability.
Conclusion
The Samba package has a vulnerability related to predictable random value generation due to issues in the GnuTLS library. It is crucial to update to the fixed version 4.17.0-r0 to mitigate the risks associated with this vulnerability. Users should also consider using Vulert to monitor and alert for open-source vulnerabilities in their software.
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FAQ
The CVSS score of this vulnerability is 5.5, indicating a moderate risk level.
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 vulnerability can lead to predictable random values, which may allow attackers to compromise cryptographic keys and gain unauthorized access to sensitive data.
Yes, the patched version of Samba is 4.17.0-r0. Updating to this version will resolve the vulnerability.
Samba is used for providing file and print services to SMB/CIFS clients, enabling interoperability between Linux/Unix servers and Windows clients.
References
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