| Name | CVE-2018-20217 |
| Description | A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-1643-1, DLA-2771-1 |
| Debian Bugs | 917387 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| krb5 (PTS) | bullseye | 1.18.3-6+deb11u5 | fixed |
| bullseye (security) | 1.18.3-6+deb11u7 | fixed | |
| bookworm | 1.20.1-2+deb12u4 | fixed | |
| bookworm (security) | 1.20.1-2+deb12u5 | fixed | |
| trixie | 1.21.3-5 | fixed | |
| trixie (security) | 1.21.3-5+deb13u1 | fixed | |
| forky, sid | 1.22.1-2.1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| krb5 | source | jessie | 1.12.1+dfsg-19+deb8u5 | DLA-1643-1 | ||
| krb5 | source | stretch | 1.15-1+deb9u3 | DLA-2771-1 | ||
| krb5 | source | (unstable) | 1.16.2-1 | low | 917387 |
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086