Samba: smb2 packet signing is not enforced when "server signing = required" is set
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9epss 0.4%
exploitation probability
0.4%top 63% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
Red Hat · Red Hat Enterprise Linux 6Red Hat · Red Hat Enterprise Linux 7Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Storage 3References
https://access.redhat.com/errata/RHSA-2023:4325https://access.redhat.com/errata/RHSA-2023:4328https://access.redhat.com/security/cve/CVE-2023-3347https://bugzilla.redhat.com/show_bug.cgi?id=2222792https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/https://security.netapp.com/advisory/ntap-20230731-0010/https://www.debian.org/security/2023/dsa-5477https://www.samba.org/samba/security/CVE-2023-3347.html