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CVE-2023-6918

Status Candidate

Overview

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

Related Files

Ubuntu Security Notice USN-6592-2
Posted Feb 5, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6592-2 - USN-6592-1 fixed vulnerabilities in libssh. This update provides the corresponding updates for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. It was discovered that libssh incorrectly handled the ProxyCommand and the ProxyJump features. A remote attacker could possibly use this issue to inject malicious code into the command of the features mentioned through the hostname parameter.

tags | advisory, remote, vulnerability
systems | linux, ubuntu
advisories | CVE-2023-6004, CVE-2023-6918
SHA-256 | 8b05812f1564de798f6fac3b6ba6391af039f74309ab8408b47cb1ef70eee3fa
Ubuntu Security Notice USN-6592-1
Posted Jan 23, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6592-1 - It was discovered that libssh incorrectly handled the ProxyCommand and the ProxyJump features. A remote attacker could possibly use this issue to inject malicious code into the command of the features mentioned through the hostname parameter. It was discovered that libssh incorrectly handled return codes when performing message digest operations. A remote attacker could possibly use this issue to cause libssh to crash, obtain sensitive information, or execute arbitrary code.

tags | advisory, remote, arbitrary
systems | linux, ubuntu
advisories | CVE-2023-6004, CVE-2023-6918
SHA-256 | 87689bd0419a935f4880956beeb13338a224d6d3b84d52dd985591784099a17a
Debian Security Advisory 5591-1
Posted Dec 28, 2023
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5591-1 - Several vulnerabilities were discovered in libssh, a tiny C SSH library.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2023-48795, CVE-2023-6004, CVE-2023-6918
SHA-256 | f815049b2837197686b4875cddb418f75a8e54d47afc59fdafc4741b2b0cb015
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