Headline
Debian Security Advisory 5409-1
Debian Linux Security Advisory 5409-1 - Two security issues have been discovered in libssh, a tiny C SSH library.
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Debian Security Advisory DSA-5409-1 [email protected]
https://www.debian.org/security/ Moritz Muehlenhoff
May 23, 2023 https://www.debian.org/security/faq
Package : libssh
CVE ID : CVE-2023-1667 CVE-2023-2283
Debian Bug : 1035832
Two security issues have been discovered in libssh, a tiny C SSH library:
CVE-2023-1667
Philip Turnbull discovered a NULL pointer dereference which could
result in denial of service.
CVE-2023-2283
Kevin Backhouse discovered that pki_verify_data_signature() may
fail to correctly validate authentication in memory pressure
situations.
For the stable distribution (bullseye), these problems have been fixed in
version 0.9.7-0+deb11u1.
We recommend that you upgrade your libssh packages.
For the detailed security status of libssh please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libssh
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: [email protected]
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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.
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.