CVE-2023-3347 Samba: smb2 packet signing is not enforced when "server signing = required" is set

What is CVE-2023-3347?

CVE-2023-3347 is a medium-severity vulnerability in Fedoraproject Fedora, published on 20 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-924, CWE-347

Which versions are affected by CVE-2023-3347?

It affects 4 products.

Products include Fedoraproject Fedora, Redhat Enterprise Linux, Redhat Storage, Samba Samba.

How do I fix CVE-2023-3347?

Apply the vendor's patch.

Is CVE-2023-3347 being exploited?

There is no known exploitation of CVE-2023-3347 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALSA-2023:4325, ALSA-2023:4328, AZL-48166, DEBIAN-CVE-2023-3347, ECHO-aaa9-06cc-7b7a, GHSA-m82c-5hpw-48f7 and 2 more.