Vulnerability in Samba
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Samba
- Fedoraproject Fedora — versions 38
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8 — versions 0:4.17.5-3.el8_8
- Red Hat Enterprise Linux 9 — versions 0:4.17.5-103.el9_2
- Red Hat Storage 3
- Red Hat Enterprise Linux — versions 8.0, 9.0
- Red Hat Storage — versions 3.0
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2023:4325 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:4328 (vendor-advisory, Third Party Advisory)
- access.redhat.com/security/cve/CVE-2023-3347 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- www.samba.org/samba/security/CVE-2023-3347.html (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-3347?
- CVE-2023-3347 is a medium-severity vulnerability in Samba, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2023-07-20.
- How severe is CVE-2023-3347?
- Medium severity. CVSS v3 base score is 5.9 out of 10.