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Slackware Linux 14.2 / 15.0 / current libssh Multiple Vulnerabilities (SSA:2023-124-01)

medium Nessus Plugin ID 175121

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Synopsis

The remote Slackware Linux host is missing a security update to libssh.

Description

The version of libssh installed on the remote host is prior to 0.10.5. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2023-124-01 advisory.

 - 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.
 (CVE-2023-2283)

 - 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)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the affected libssh package.

Plugin Details

Severity: Medium

ID: 175121

File Name: Slackware_SSA_2023-124-01.nasl

Version: 1.5

Type: local

Published: 5/4/2023

Updated: 12/22/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2023-2283

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:slackware:slackware_linux:libssh, cpe:/o:slackware:slackware_linux, cpe:/o:slackware:slackware_linux:14.2, cpe:/o:slackware:slackware_linux:15.0

Required KB Items: Host/local_checks_enabled, Host/Slackware/release, Host/Slackware/packages

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/4/2023

Vulnerability Publication Date: 5/4/2023

Reference Information

CVE: CVE-2023-1667, CVE-2023-2283

IAVA: 2023-A-0517-S