Out of Bounds Memory Access in libssh2 - CVE-2020-22218
Summary
DEBIAN-CVE-2020-22218: An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory. Affects libssh2 versions < 1.9.0-2+deb11u1. Fixed in 1.9.0-2+deb11u1. How to fix ↓
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Background
libssh2 is a widely used library that provides an API for implementing SSH2 client functionality in applications. It is utilized for secure file transfers and remote command execution. The library is known for its lightweight design and ease of integration into various programming environments. However, a vulnerability has been identified that allows attackers to exploit out of bounds memory access, potentially leading to unauthorized access or application crashes.
Vulnerability Detail
An issue was discovered in the function _libssh2_packet_add in libssh2 version 1.10.0. This vulnerability allows attackers to access memory locations outside the intended bounds, which can lead to various security risks, including data corruption, application crashes, and unauthorized access to sensitive information. The vulnerability arises from improper handling of packet data, making it crucial for users to address it promptly to maintain application security.
How To Fix
Minimum fixed version
1.9.0-2+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libssh2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling features that rely on libssh2 until the package can be updated. This may involve modifying application configurations to avoid using SSH functionalities provided by the library.
Conclusion
The vulnerability CVE-2020-22218 in libssh2 poses significant security risks due to out of bounds memory access. It is essential for users to update to the patched versions of the library to safeguard their applications. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
See every vulnerability recorded for libssh2 →
FAQ
CVE-2020-22218 is a vulnerability in libssh2 that allows attackers to access out of bounds memory, potentially leading to security breaches.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Check your application against this vulnerability using the Vulert playground at Vulert Scanner.
The risks include data corruption, application crashes, and unauthorized access to sensitive information, which can compromise the security of your application.
Yes, patches are available for various Debian versions. Ensure you update to the specified patched versions to mitigate the risk.
If an immediate update is not possible, consider disabling features that rely on libssh2 until the vulnerability can be addressed.
References
Related vulnerabilities
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