CVE-2023-3347: Samba: smb2 packet signing is not enforced when "server signing = required" is set
First published: Thu Jul 13 2023(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/samba | <2:4.17.7+dfsg-1ubuntu1.1 | 2:4.17.7+dfsg-1ubuntu1.1 |
| Samba Samba | >=4.17.0<4.17.10 | |
| Samba Samba | >=4.18.0<4.18.5 | |
| Redhat Storage | =3.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| Fedoraproject Fedora | =38 | |
| debian/samba | 2:4.9.5+dfsg-5+deb10u3 2:4.9.5+dfsg-5+deb10u4 2:4.13.13+dfsg-1~deb11u5 2:4.17.12+dfsg-0+deb12u1 2:4.19.3+dfsg-2 |
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Reference Links
- https://www.samba.org/samba/security/CVE-2023-3347.html
- https://bugzilla.redhat.com/show_bug.cgi?id=2222792
- https://access.redhat.com/security/cve/CVE-2023-3347
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/
- https://access.redhat.com/errata/RHSA-2023:4325
- https://access.redhat.com/errata/RHSA-2023:4328
- 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-5477
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3347
- https://ubuntu.com/security/notices/USN-6238-1
- https://nvd.nist.gov/vuln/detail/CVE-2023-3347
- https://launchpad.net/bugs/cve/CVE-2023-3347
- https://security-tracker.debian.org/tracker/CVE-2023-3347
- https://ubuntu.com/security/CVE-2023-3347
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2224255
Frequently Asked Questions
What is CVE-2023-3347?
CVE-2023-3347 is a vulnerability found in Samba's SMB2 packet signing mechanism.
What is the severity of CVE-2023-3347?
The severity of CVE-2023-3347 is medium with a severity value of 5.9.
How does CVE-2023-3347 affect Samba?
CVE-2023-3347 affects Samba by bypassing the SMB2 packet signing mechanism if certain conditions are met.
How can I fix CVE-2023-3347?
To fix CVE-2023-3347, update Samba to version 2:4.17.7+dfsg-1ubuntu1.1 (for Ubuntu), 4.17.10 or 4.18.5 (for Redhat), or the corresponding patched version for your distribution.
Where can I find more information about CVE-2023-3347?
For more information about CVE-2023-3347, you can visit the official Samba website at https://www.samba.org/samba/security/CVE-2023-3347.html
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