CVE-2022-2127: Samba: out-of-bounds read in winbind auth_crap

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-20 · updated 2026-06-17
Weakness: CWE-125

Description

An out-of-bounds read vulnerability was found in Samba due to insufficient length checks in winbindd_pam_auth_crap.c. When performing NTLM authentication, the client replies to cryptographic challenges back to the server. These replies have variable lengths, and Winbind fails to check the lan manager response length. When Winbind is used for NTLM authentication, a maliciously crafted request can trigger an out-of-bounds read in Winbind, possibly resulting in a crash.

Affected products

Debian Linux: 12.0
Fedoraproject Fedora: 37, 38
Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0
Samba: from 4.16.0 before 4.16.10; from 4.17.0 before 4.17.9; from 4.18.0 before 4.18.4 — fixed in 4.16.10, 4.17.9, 4.18.4

How to fix

Upgrade to a fixed version: Samba 4.16.10, 4.17.9, 4.18.4. Check the vendor advisory for mitigations.

References

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