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Debian DSA-5477-1 : samba - security update
medium Nessus Plugin ID 179819
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Synopsis
The remote Debian host is missing one or more security-related updates.Description
The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5477 advisory.- An out-of-bounds read vulnerability was found in Samba due to insufficient length checks in winbindd_pam_auth_crap.c. When performing NTLM authentication, the client replies to cryptographic challenges back to the server. These replies have variable lengths, and Winbind fails to check the lan manager response length. When Winbind is used for NTLM authentication, a maliciously crafted request can trigger an out-of-bounds read in Winbind, possibly resulting in a crash. (CVE-2022-2127)
- A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured server signing = required or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in- the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data. (CVE-2023-3347)
- An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition. (CVE-2023-34966)
- A Type Confusion vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets, one encoded data structure is a key-value style dictionary where the keys are character strings, and the values can be any of the supported types in the mdssvc protocol. Due to a lack of type checking in callers of the dalloc_value_for_key() function, which returns the object associated with a key, a caller may trigger a crash in talloc_get_size() when talloc detects that the passed-in pointer is not a valid talloc pointer. With an RPC worker process shared among multiple client connections, a malicious client or attacker can trigger a process crash in a shared RPC mdssvc worker process, affecting all other clients this worker serves. (CVE-2023-34967)
- A path disclosure vulnerability was found in Samba. As part of the Spotlight protocol, Samba discloses the server-side absolute path of shares, files, and directories in the results for search queries. This flaw allows a malicious client or an attacker with a targeted RPC request to view the information that is part of the disclosed path. (CVE-2023-34968)
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 samba packages.For the stable distribution (bookworm), these problems have been fixed in version 2
See Also
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1041043
https://security-tracker.debian.org/tracker/source-package/samba
https://www.debian.org/security/2023/dsa-5477
https://security-tracker.debian.org/tracker/CVE-2022-2127
https://security-tracker.debian.org/tracker/CVE-2023-3347
https://security-tracker.debian.org/tracker/CVE-2023-34966
https://security-tracker.debian.org/tracker/CVE-2023-34967
Plugin Details
Severity: Medium
ID: 179819
File Name: debian_DSA-5477.nasl
Version: 1.2
Type: local
Agent: unix
Family: Debian Local Security Checks
Published: 8/15/2023
Updated: 3/29/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5.4
Temporal Score: 4
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N
CVSS Score Source: CVE-2023-3347
CVSS v3
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 5.2
Vector: CVSS:3.0/AV:N/AC:H/PR:N/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:debian:debian_linux:libpam-winbind, p-cpe:/a:debian:debian_linux:libldb2, p-cpe:/a:debian:debian_linux:samba-dsdb-modules, p-cpe:/a:debian:debian_linux:samba-ad-provision, p-cpe:/a:debian:debian_linux:python3-samba, p-cpe:/a:debian:debian_linux:ldb-tools, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:ctdb, p-cpe:/a:debian:debian_linux:smbclient, p-cpe:/a:debian:debian_linux:winbind, p-cpe:/a:debian:debian_linux:libsmbclient, p-cpe:/a:debian:debian_linux:samba-dev, p-cpe:/a:debian:debian_linux:samba-libs, p-cpe:/a:debian:debian_linux:samba, p-cpe:/a:debian:debian_linux:registry-tools, p-cpe:/a:debian:debian_linux:samba-common-bin, p-cpe:/a:debian:debian_linux:libwbclient-dev, p-cpe:/a:debian:debian_linux:samba-ad-dc, p-cpe:/a:debian:debian_linux:samba-vfs-modules, p-cpe:/a:debian:debian_linux:samba-testsuite, p-cpe:/a:debian:debian_linux:libwbclient0, p-cpe:/a:debian:debian_linux:python3-ldb-dev, p-cpe:/a:debian:debian_linux:python3-ldb, p-cpe:/a:debian:debian_linux:libsmbclient-dev, p-cpe:/a:debian:debian_linux:libnss-winbind, p-cpe:/a:debian:debian_linux:libldb-dev, p-cpe:/a:debian:debian_linux:samba-common
Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
Exploit Ease: No known exploits are available
Patch Publication Date: 8/14/2023
Vulnerability Publication Date: 7/20/2023
Reference Information
CVE: CVE-2022-2127, CVE-2023-3347, CVE-2023-34966, CVE-2023-34967, CVE-2023-34968
IAVA: 2023-A-0376-S