Uninitialized Pointer Access Vulnerability in GnuTLS: CVE-2019-3836
Summary
ALPINE-CVE-2019-3836: It was discovered in gnutls before version 3.6.7 upstream that there is an uninitialized pointer access in gnutls versions 3.6.3 or later which can be triggered by certain post-handshake messages. Affects gnutls versions < 3.6.7-r0. Fixed in 3.6.7-r0. How to fix ↓
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Background
GnuTLS is a secure communications library implementing the SSL, TLS, and DTLS protocols. It is widely used for securing communications over networks. The library provides a robust set of features for encryption, authentication, and integrity, making it a critical component in many applications. However, certain versions of GnuTLS are vulnerable to an uninitialized pointer access issue, which can lead to security breaches.
Vulnerability Detail
The vulnerability, identified as CVE-2019-3836, arises from an uninitialized pointer access in GnuTLS versions 3.6.3 and later. This flaw can be triggered by specific post-handshake messages, potentially leading to denial of service or other unintended behaviors. The lack of proper initialization may allow an attacker to exploit this vulnerability, compromising the security of applications relying on GnuTLS for secure communications.
How To Fix
Minimum fixed version
3.6.7-r0
This is the first release that contains the fix.
sudo apk add --upgrade gnutlsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If an immediate update is not feasible, consider implementing network-level protections such as firewalls to limit exposure to potential attacks that exploit this vulnerability. Additionally, review application logs for any unusual activity that may indicate exploitation attempts.
Conclusion
CVE-2019-3836 represents a significant security risk for applications using vulnerable versions of GnuTLS. It is crucial to update to the patched version to safeguard against potential exploits. Regular monitoring and vulnerability assessments are recommended to maintain application security.
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FAQ
CVE-2019-3836 is a vulnerability in GnuTLS that involves an uninitialized pointer access, which can be exploited through specific post-handshake messages.
GnuTLS versions 3.6.3 and later are affected by this vulnerability.
Exploitation of this vulnerability can lead to denial of service or other unintended behaviors in applications using GnuTLS.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected without needing to sign up.
The CVSS score for CVE-2019-3836 is 7.5, indicating a high severity level.
References
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