Detections
Analytics
Alpine: multiple libssh packages: security update to 0.9.6-r0
medium Tenable Self-Hosted Container Security Plugin ID 405318
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared
secrets during the lifetime of the session. One of them is called secret_hash and the other session_id.
Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as
an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked
as long as these buffers were same. But the key re-exchange operation can also change the key exchange
method, which can be based on hash of different size, eventually creating "secret_hash" of different size
than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used
again during second key re-exchange. (CVE-2021-3634)
See Also
Plugin Details
Severity: Medium
ID: 405318
Version: Revision 1.28
Type: Local
Published: 10/31/2023
Updated: 7/2/2026
Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.18
CVSS v2
Risk Factor: Medium
Base Score: 4
Temporal Score: 3
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS Score Source: CVE-2021-3634
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.7
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 8/31/2021
Reference Information
CVE: CVE-2021-3634
IAVA: 2022-A-0041-S