CVE-2023-3347

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.

Score

CVSS 3.1 5.9 Medium

Status

Modified - secalert@redhat.com

Published

2023-07-20

Last modified

2025-11-20

Weaknesses

CWE-347, CWE-924

Affected products

• Fedora (Fedoraproject)
• Enterprise Linux (Redhat)
• Storage (Redhat)
• Samba (Samba)

References

• https://access.redhat.com/errata/RHSA-2023:4325
• https://access.redhat.com/errata/RHSA-2023:4328
• https://access.redhat.com/security/cve/CVE-2023-3347
• https://bugzilla.redhat.com/show_bug.cgi?id=2222792
• https://www.samba.org/samba/security/CVE-2023-3347.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467AJGR5DYBGZL…
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OT74M42E6C36W7PQVY3OS4ZM…
• https://security.netapp.com/advisory/ntap-20230731-0010/
• https://www.debian.org/security/2023/dsa-5477