Improper Authentication Affecting libssh package, versions <0:0.10.5-1.amzn2023.0.1


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.2% (42nd percentile)

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  • Snyk IDSNYK-AMZN2023-LIBSSH-5671080
  • published8 Jun 2023
  • disclosed26 May 2023

Introduced: 26 May 2023

CVE-2023-2283  (opens in a new tab)
CWE-287  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 libssh to version 0:0.10.5-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2023-186.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in thepki_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.

CVSS Base Scores

version 3.1