CVE-2022-42898
Published: 25 December 2022
PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has "a similar bug."
Notes
| Author | Note |
|---|---|
| mdeslaur | Per upstream Samba advisory, this is only an issue on 32-bit systems. |
| rodrigo-zaiden | a regression in heimdal was reported by samba and fixed in https://github.com/heimdal/heimdal/pull/1025 |
| mdeslaur | See samba bug for samba regression fix not yet commited The focal samba update was temporarily reverted by USN 5822-2 because it introduced regressions. It was later updated again with USN 5936-1. |
Priority
Status
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.8 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42898
- https://www.samba.org/samba/security/CVE-2022-42898.html
- https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
- https://ubuntu.com/security/notices/USN-5800-1
- https://ubuntu.com/security/notices/USN-5822-1
- https://ubuntu.com/security/notices/USN-5822-2
- https://ubuntu.com/security/notices/USN-5828-1
- https://ubuntu.com/security/notices/USN-5936-1
- NVD
- Launchpad
- Debian