Headline
Ubuntu Security Notice USN-6138-1
Ubuntu Security Notice 6138-1 - Philip Turnbull discovered that libssh incorrectly handled rekeying with algorithm guessing. A remote attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code. Kevin Backhouse discovered that libssh incorrectly handled verifying data signatures. A remote attacker could possibly use this issue to bypass authorization.
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Ubuntu Security Notice USN-6138-1
June 05, 2023
libssh vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in libssh.
Software Description:
- libssh: A tiny C SSH library
Details:
Philip Turnbull discovered that libssh incorrectly handled rekeying with
algorithm guessing. A remote attacker could use this issue to cause libssh
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2023-1667)
Kevin Backhouse discovered that libssh incorrectly handled verifying data
signatures. A remote attacker could possibly use this issue to bypass
authorization. (CVE-2023-2283)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.04:
libssh-4 0.10.4-2ubuntu0.1
Ubuntu 22.10:
libssh-4 0.9.6-2ubuntu0.22.10.1
Ubuntu 22.04 LTS:
libssh-4 0.9.6-2ubuntu0.22.04.1
Ubuntu 20.04 LTS:
libssh-4 0.9.3-2ubuntu2.3
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6138-1
CVE-2023-1667, CVE-2023-2283
Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.10.4-2ubuntu0.1
https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.10.1
https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.04.1
https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.3
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A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK.
A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.
Debian Linux Security Advisory 5409-1 - Two security issues have been discovered in libssh, a tiny C SSH library.
Debian Linux Security Advisory 5409-1 - Two security issues have been discovered in libssh, a tiny C SSH library.