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TI-2023-03113 Aliases CVE-2023-3326GHSA-vjhp-527w-c5vj

Network authentication attack via pam_krb5

Priority MEDIUM 51CWE-303Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01098 65th percentileScored 2026-11-07
Fix Fixed FreeBSD (FreeBSD): 13.2-RELEASE-p1, 13.1-RELEASE-p8, 12.4-RELEASE-p3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeBSDFreeBSD13.2-RELEASE to before 13.2-RELEASE-p1; 13.1-RELEASE to before 13.1-RELEASE-p8; 12.4-RELEASE to before 12.4-RELEASE-p313.2-RELEASE-p1, 13.1-RELEASE-p8, 12.4-RELEASE-p3Patch availableCNA
  • FreeBSD VendorFreeBSD Affected 13.2-RELEASE to before 13.2-RELEASE-p1; 13.1-RELEASE to before 13.1-RELEASE-p8; 12.4-RELEASE to before 12.4-RELEASE-p3 Fixed in 13.2-RELEASE-p1, 13.1-RELEASE-p8, 12.4-RELEASE-p3 Patch available CNA

CPE configurations NVD · 18

CPEVersionsRoleVendor
cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*before 12.4; 13.0 to before 13.1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.4:-:*:*:*:*:*:*12.4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.4:p1:*:*:*:*:*:*12.4 p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.4:p2:*:*:*:*:*:*12.4 p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.4:rc2-p1:*:*:*:*:*:*12.4 rc2-p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.4:rc2-p2:*:*:*:*:*:*12.4 rc2-p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:-:*:*:*:*:*:*13.1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:b1-p1:*:*:*:*:*:*13.1 b1-p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:b2-p2:*:*:*:*:*:*13.1 b2-p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p1:*:*:*:*:*:*13.1 p1VulnerableFreeBSD
  • cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:* Versions before 12.4; 13.0 to before 13.1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.4:-:*:*:*:*:*:* Versions 12.4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.4:p1:*:*:*:*:*:* Versions 12.4 p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.4:p2:*:*:*:*:*:* Versions 12.4 p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.4:rc2-p1:*:*:*:*:*:* Versions 12.4 rc2-p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.4:rc2-p2:*:*:*:*:*:* Versions 12.4 rc2-p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:-:*:*:*:*:*:* Versions 13.1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:b1-p1:*:*:*:*:*:* Versions 13.1 b1-p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:b2-p2:*:*:*:*:*:* Versions 13.1 b2-p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p1:*:*:*:*:*:* Versions 13.1 p1 Vulnerable ·FreeBSD
Show 8 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:freebsd:freebsd:13.1:p2:*:*:*:*:*:*13.1 p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p3:*:*:*:*:*:*13.1 p3VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p4:*:*:*:*:*:*13.1 p4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p5:*:*:*:*:*:*13.1 p5VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p6:*:*:*:*:*:*13.1 p6VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:p7:*:*:*:*:*:*13.1 p7VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.1:rc1-p1:*:*:*:*:*:*13.1 rc1-p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.2:-:*:*:*:*:*:*13.2VulnerableFreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p2:*:*:*:*:*:* Versions 13.1 p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p3:*:*:*:*:*:* Versions 13.1 p3 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p4:*:*:*:*:*:* Versions 13.1 p4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p5:*:*:*:*:*:* Versions 13.1 p5 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p6:*:*:*:*:*:* Versions 13.1 p6 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:p7:*:*:*:*:*:* Versions 13.1 p7 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.1:rc1-p1:*:*:*:*:*:* Versions 13.1 rc1-p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.2:-:*:*:*:*:*:* Versions 13.2 Vulnerable ·FreeBSD

Remediation

  • Fix · CNA FreeBSD (FreeBSD) Fixed in 13.2-RELEASE-p1, 13.1-RELEASE-p8, 12.4-RELEASE-p3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-3326
  2. 2026-10-03 Alias added: GHSA-vjhp-527w-c5vj

References

Advisory 3

  • TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
  • TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
  • TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
  • TI-2003-00642 The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code… CVSS 2.0HIGH 10.0
See all 576 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences