Security Vulnerability in libssh: Multiple Issues Leading to Potential Exploits
Summary
ALSA-2026:18683: Moderate: libssh security update. Affects libssh versions < 0.10.4-18.el9. Fixed in 0.10.4-18.el9. How to fix ↓
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Background
libssh is a widely used library that implements the SSH protocol, enabling secure communication between client and server applications. It is integral for secure file transfers, remote server management, and secure shell access. However, recent vulnerabilities have been identified that could compromise the security and stability of applications relying on this library.
Vulnerability Detail
The vulnerabilities in libssh stem from various coding flaws, including a double free vulnerability in key export functions, use of uninitialized variables, and buffer overflows. These issues could lead to memory corruption, denial of service, and potential unauthorized access to sensitive data. Specifically, the vulnerabilities include improper handling of key exchanges, buffer underflows, and inadequate sanitation of paths from SCP servers, which could be exploited by attackers to disrupt services or gain unauthorized access.
How To Fix
Minimum fixed version
0.10.4-18.el9
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
As a temporary measure, you can limit the exposure of your applications by restricting access to the affected services and monitoring for unusual activity. Additionally, consider implementing firewall rules to block unauthorized access while awaiting the patch.
Conclusion
The identified vulnerabilities in libssh pose significant risks to applications relying on this library for secure communications. It is crucial to update to the latest patched version to mitigate these risks and ensure the integrity and security of your systems.
See every vulnerability recorded for libssh →
FAQ
libssh is a library that implements the SSH protocol, allowing secure communication for applications that require encrypted data transfer.
The vulnerabilities include double free errors, buffer overflows, improper variable initialization, and denial of service issues.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
If an immediate update is not possible, implement workarounds such as restricting access to affected services and monitoring for unusual activity.
Detailed information can be found on the CVE pages linked in the advisory, as well as in the AlmaLinux release notes.
Related vulnerabilities
Recent vulnerabilities recorded for libssh.
