Bug 2149894 (CVE-2022-4254)

Summary: CVE-2022-4254 sssd: libsss_certmap fails to sanitise certificate data used in LDAP filters
Product: [Other] Security Response Reporter: TEJ RATHI <trathi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abokovoy, aboscatt, atikhono, cheimes, ftweedal, jburrell, mcascell, mkosek, pbrezina, saroy, sbose, security-response-team, spoore, sssd-maint, thoger
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: sssd 2.3.1 Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in SSSD, in the libsss_certmap functionality. PKINIT enables a client to authenticate to the KDC using an X.509 certificate and the corresponding private key, rather than a passphrase or keytab. FreeIPA uses mapping rules to map a certificate presented during a PKINIT authentication request to the corresponding principal. The mapping filter is vulnerable to LDAP filter injection. The search result can be influenced by values in the certificate, which may be attacker controlled. In the most extreme case, an attacker could gain control of the admin account, leading to full domain takeover.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2023-01-26 22:52:14 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: 2149902, 2149903, 2149904    
Bug Blocks: 2149831    

Description TEJ RATHI 2022-12-01 10:45:17 UTC 
FreeIPA supports the Kerberos PKINIT protocol extension (RFC 4556). PKINIT enables a client to authenticate to the KDC using an X.509 certificate and the corresonding private key, rather than a passphrase or keytab. FreeIPA uses mapping rules to map a certificate presented during a PKINIT authentication request to the corresponding principal. The mapping filter is vulnerable to LDAP filter injection. The search result can be influenced by values in the certificate, which may be attacker controlled. In the most extreme case, an attacker could gain control of the admin account, leading to full domain takeover. 

FreeIPA is not vulnerable in its default configuration.

The problem is in libsss_certmap, which is part of SSSD. FreeIPA servers use this library in ipa_kdb Kerberos plugin implementation. 

The issue was introduced in SSSD 1.15.3 (when libsss_certmap was introduced) and resolved in SSSD 2.3.1.
Comment 26 errata-xmlrpc 2023-01-24 08:45:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2023:0397 https://access.redhat.com/errata/RHSA-2023:0397
Comment 27 errata-xmlrpc 2023-01-24 10:10:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2023:0403 https://access.redhat.com/errata/RHSA-2023:0403
Comment 28 errata-xmlrpc 2023-01-24 15:11:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions

Via RHSA-2023:0442 https://access.redhat.com/errata/RHSA-2023:0442
Comment 31 Product Security DevOps Team 2023-01-26 22:52:10 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-4254
Comment 32 TEJ RATHI 2023-01-27 12:43:22 UTC 
References:

https://github.com/SSSD/sssd/issues/5135
https://github.com/SSSD/sssd/commit/a2b9a84460429181f2a4fa7e2bb5ab49fd561274