Bug 2189736 (CVE-2023-2283) - CVE-2023-2283 libssh: authorization bypass in pki_verify_data_signature
Summary: CVE-2023-2283 libssh: authorization bypass in pki_verify_data_signature
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2023-2283
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2189740 2189741 2189742 2196100 2196101 2196102 2196103 2196104
Blocks: 2189609
TreeView+ depends on / blocked
 
Reported: 2023-04-26 04:06 UTC by Sandipan Roy
Modified: 2024-03-19 13:12 UTC (History)
54 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Environment:
Last Closed: 2023-06-27 19:45:50 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2024:0545 0 None None None 2024-01-29 14:35:36 UTC
Red Hat Product Errata RHSA-2023:3839 0 None None None 2023-06-27 14:58:04 UTC
Red Hat Product Errata RHSA-2023:6643 0 None None None 2023-11-07 08:22:25 UTC
Red Hat Product Errata RHSA-2024:0538 0 None None None 2024-01-29 08:20:06 UTC

Description Sandipan Roy 2023-04-26 04:06:32 UTC 
The authentication check of the connecting client can be bypassed in the function `pki_verify_data_signature` in circumstances of memory allocation problems. This may happen f.e. if not enough 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.
Comment 3 Sandipan Roy 2023-05-08 04:53:22 UTC 
Created libssh tracking bugs for this issue:

Affects: epel-7 [bug 2196100]
Affects: fedora-all [bug 2196102]


Created libssh2 tracking bugs for this issue:

Affects: epel-8 [bug 2196101]
Affects: fedora-all [bug 2196103]


Created mingw-libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 2196104]
Comment 5 errata-xmlrpc 2023-06-27 14:57:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:3839 https://access.redhat.com/errata/RHSA-2023:3839
Comment 6 Product Security DevOps Team 2023-06-27 19:45:45 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2023-2283
Comment 7 Ginadavis 2023-08-16 02:11:29 UTC Comment hidden (spam)
Comment 8 errata-xmlrpc 2023-11-07 08:22:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:6643 https://access.redhat.com/errata/RHSA-2023:6643
Comment 10 errata-xmlrpc 2024-01-29 08:20:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0538 https://access.redhat.com/errata/RHSA-2024:0538
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