Bug 2154320 (CVE-2022-37967)

Summary: CVE-2022-37967 samba: Kerberos constrained delegation ticket forgery possible against Samba AD DC
Product: [Other] Security Response Reporter: Marco Benatto <mbenatto>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abokovoy, anoopcs, asn, brking, davidn, dkarpele, gdeschner, haoli, hkataria, jajackso, jarrpa, jcammara, jmitchel, jneedle, jrische, kegrant, koliveir, kshier, mabashia, nobody, pbraun, pfilipen, relrod, rhs-smb, saroy, shvarugh, simaishi, smcdonal, stcannon, teagle, tfister, thavo, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: samba 4.15.13, samba 4.16.8 Doc Type: If docs needed, set a value
Doc Text:
A Kerberos elevation of privilege vulnerability was found in all versions Samba AD DC. It exploits weaknesses in the RC4-HMAC cipher, allowing a service account with constrained delegation permission to forge a more powerful Kerberos ticket. This flaw could enable privilege escalation by adding unauthorized groups to the Privilege Attribute Certificate (PAC) without knowing the krbtgt key.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2022-12-16 18:48:16 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2154322, 2154323, 2154324, 2154325, 2154326, 2154327, 2154328, 2154329, 2154330, 2154331, 2154332    
Bug Blocks: 2154280    

Description Marco Benatto 2022-12-16 15:28:27 UTC 
A service account with the special constrained delegation permission could forge a more powerful ticket than the one it was presented with.
Comment 1 Marco Benatto 2022-12-16 15:29:27 UTC 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 2154322]
Comment 5 Sandipan Roy 2025-04-16 14:26:50 UTC 
The Samba package as shipped with Red Hat Enterprise Linux 6, 7, 8 and 9 is not affected by this issue as Red Hat doesn't provide the AD domain controller capability with it.