| Name | CVE-2021-36222 |
| Description | ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4944-1 |
| Debian Bugs | 991365 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| krb5 (PTS) | buster | 1.17-3+deb10u4 | fixed |
| buster (security) | 1.17-3+deb10u6 | fixed |
| bullseye | 1.18.3-6+deb11u4 | fixed |
| bullseye (security) | 1.18.3-6+deb11u3 | fixed |
| bookworm | 1.20.1-2+deb12u1 | fixed |
| trixie | 1.20.1-5 | fixed |
| sid | 1.20.1-6 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| krb5 | source | stretch | (not affected) | | | |
| krb5 | source | buster | 1.17-3+deb10u2 | | DSA-4944-1 | |
| krb5 | source | (unstable) | 1.18.3-6 | | | 991365 |
Notes
[stretch] - krb5 <not-affected> (Vulnerable code (k5memdup0()) introduced later)
https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562
http://krbdev.mit.edu/rt/Ticket/Display.html?id=9007