Security Flaw in libssh: Incorrect Return Code Handling Vulnerability
Summary
ALSA-2025:21977: Moderate: libssh security update. Affects libssh versions < 0.9.6-16.el8_10. Fixed in 0.9.6-16.el8_10. How to fix ↓
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Background
libssh is a widely used library that implements the SSH (Secure Shell) protocol, enabling secure communication between client and server applications. It is integral for various applications requiring secure data transmission over unsecured networks. The library is designed to provide a robust framework for implementing SSH functionalities, including authentication, encryption, and data integrity. However, vulnerabilities in such libraries can lead to severe security risks, making it crucial for developers to stay informed about potential issues.
Vulnerability Detail
The vulnerability identified as CVE-2025-5372 in libssh pertains to incorrect return code handling in the ssh_kdf() function. This flaw can lead to unintended behavior during the key derivation process, potentially allowing attackers to exploit the library in ways that compromise the security of the SSH protocol. The ramifications of this vulnerability could include unauthorized access to sensitive data or systems, making it imperative for users of the library to address this issue promptly.
How To Fix
Minimum fixed version
0.9.6-16.el8_10
This is the first release that contains the fix.
sudo dnf update libsshTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, no specific workarounds have been provided for this vulnerability. The best course of action is to apply the available patch as soon as possible.
Conclusion
The libssh library has a critical vulnerability (CVE-2025-5372) that requires immediate attention. Users should update to the patched version to mitigate the risks associated with this flaw. Staying informed and proactive in addressing such vulnerabilities is essential for maintaining secure applications.
See every vulnerability recorded for libssh →
FAQ
libssh is a library that implements the SSH protocol, allowing secure communication between client and server applications.
CVE-2025-5372 is the identifier for a vulnerability in libssh related to incorrect return code handling in the ssh_kdf() function.
The risks include potential unauthorized access to sensitive data and systems due to improper handling of return codes during key derivation.
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You can update libssh by running the command 'sudo dnf update libssh' in your terminal to install the patched version.
Related vulnerabilities
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