QID 355399

Date Published: 2023-06-14

QID 355399: Amazon Linux Security Advisory for libssh : ALAS2023-2023-186

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. (
( CVE-2023-1667) 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. (
( CVE-2023-2283)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 6.5 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-186 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355399

    CVE-2023-1667 | CVE-2023-2283 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-186 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-186.html
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