Detections
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Amazon Linux 2 : samba (ALAS-2023-2367)
medium Nessus Plugin ID 186552
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of samba installed on the remote host is prior to 4.10.16-24. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2367 advisory.When doing NTLM authentication, the client sends replies tocryptographic challenges back to the server.
These replieshave variable length. Winbind did not properly bounds-checkthe lan manager response length, which despite the lanmanager version no longer being used is still part of theprotocol.
If the system is running Samba's ntlm_auth as authentication backendfor services like Squid (or a very unusual configuration withFreeRADIUS), the vulnarebility is remotely exploitable
If not so configured, or to exploit this vulnerability locally, theuser must have access to the privileged winbindd UNIX domainsocket (a subdirectory with name 'winbindd_privileged' under statedirectory, as set in the smb.conf).
This access is normally only given so special system services likeSquid or FreeRADIUS, that use this feature. (CVE-2022-2127)
SMB client can truncate files to 0 bytes by opening files with OVERWRITE disposition when using the acl_xattr Samba VFS module with the smb.conf setting acl_xattr:ignore system acls = yes (CVE-2023-4091)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Run 'yum update samba' to update your system.See Also
https://alas.aws.amazon.com/AL2/ALAS-2023-2367.html
https://alas.aws.amazon.com/cve/html/CVE-2022-2127.html
Plugin Details
Severity: Medium
ID: 186552
File Name: al2_ALAS-2023-2367.nasl
Version: 1.1
Type: local
Agent: unix
Published: 12/4/2023
Updated: 12/11/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N
CVSS Score Source: CVE-2023-4091
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:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:libsmbclient, p-cpe:/a:amazon:linux:samba, p-cpe:/a:amazon:linux:samba-pidl, p-cpe:/a:amazon:linux:libwbclient, p-cpe:/a:amazon:linux:samba-common-libs, p-cpe:/a:amazon:linux:samba-libs, p-cpe:/a:amazon:linux:samba-winbind-krb5-locator, p-cpe:/a:amazon:linux:samba-python, p-cpe:/a:amazon:linux:ctdb-tests, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:samba-test, p-cpe:/a:amazon:linux:samba-client-libs, p-cpe:/a:amazon:linux:ctdb, p-cpe:/a:amazon:linux:samba-dc, p-cpe:/a:amazon:linux:samba-test-libs, p-cpe:/a:amazon:linux:samba-vfs-glusterfs, p-cpe:/a:amazon:linux:libwbclient-devel, p-cpe:/a:amazon:linux:samba-winbind-clients, p-cpe:/a:amazon:linux:samba-krb5-printing, p-cpe:/a:amazon:linux:samba-winbind, p-cpe:/a:amazon:linux:samba-debuginfo, p-cpe:/a:amazon:linux:samba-python-test, p-cpe:/a:amazon:linux:samba-client, p-cpe:/a:amazon:linux:samba-common-tools, p-cpe:/a:amazon:linux:samba-devel, p-cpe:/a:amazon:linux:samba-common, p-cpe:/a:amazon:linux:libsmbclient-devel, p-cpe:/a:amazon:linux:samba-dc-libs, p-cpe:/a:amazon:linux:samba-winbind-modules
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 11/29/2023
Vulnerability Publication Date: 7/20/2023
Reference Information
CVE: CVE-2022-2127, CVE-2023-4091
IAVA: 2023-A-0376-S, 2023-A-0535