Moderate Security Vulnerability in libssh: Out-of-Bounds Read Issue
Summary
ALSA-2025:21013: Moderate: libssh security update. Affects libssh versions < 0.11.1-4.el10_1. Fixed in 0.11.1-4.el10_1. 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 to various systems for secure data transmission and remote access. The library is designed to provide a robust framework for implementing SSH functionalities, but like any software, it can be susceptible to vulnerabilities that may compromise its security and functionality.
Vulnerability Detail
The vulnerability identified as CVE-2025-5318 involves an out-of-bounds read in the sftp_handle() function of libssh. This flaw can potentially allow an attacker to read memory locations that they should not have access to, leading to unauthorized data exposure or application crashes. The issue arises from improper handling of input data, which can be exploited if an attacker crafts a malicious request to the SFTP server.
How To Fix
Minimum fixed version
0.11.1-4.el10_1
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, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the patch as soon as it is available.
Conclusion
The libssh library has a moderate security vulnerability (CVE-2025-5318) that can lead to out-of-bounds reads, posing risks to data security. Users are strongly advised to update to the latest patched version to mitigate these risks. Regular monitoring and prompt updates are essential for maintaining application security.
See every vulnerability recorded for libssh →
FAQ
CVE-2025-5318 is a security vulnerability in the libssh library that allows for an out-of-bounds read, potentially leading to unauthorized data access.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
Exploiting this vulnerability could allow attackers to read sensitive data from memory, potentially leading to data breaches or application instability.
While there are no specific workarounds, it is crucial to limit access to the affected services and monitor for any suspicious activity until the update can be applied.
For detailed information, you can refer to the CVE page associated with CVE-2025-5318, which provides insights into the vulnerability's impact and technical details.
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