CVE-2018-5710

NameCVE-2018-5710
DescriptionAn issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. The pre-defined function "strlen" is getting a "NULL" string as a parameter value in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in the Key Distribution Center (KDC), which allows remote authenticated users to cause a denial of service (NULL pointer dereference) via a modified kadmin client.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1643-1, DLA-2771-1
Debian Bugs889685

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)jessie, jessie (lts)1.12.1+dfsg-19+deb8u9fixed
stretch (security)1.15-1+deb9u3fixed
stretch (lts), stretch1.15-1+deb9u6fixed
buster, buster (lts)1.17-3+deb10u7fixed
buster (security)1.17-3+deb10u6fixed
bullseye (security), bullseye1.18.3-6+deb11u5fixed
bookworm (security), bookworm1.20.1-2+deb12u2fixed
sid, trixie1.21.3-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
krb5sourcewheezy(not affected)
krb5sourcejessie1.12.1+dfsg-19+deb8u5DLA-1643-1
krb5sourcestretch1.15-1+deb9u3DLA-2771-1
krb5source(unstable)1.16.1-1889685

Notes

[wheezy] - krb5 <not-affected> (all strlen() parameters are checked for NULL)
https://github.com/poojamnit/Kerberos-V5-1.16-Vulnerabilities/tree/master/Denial%20Of%20Service(DoS)
The CVE is a duplicate of the #891869 issue(s) due to reporter not
having coordinated with upstream and the CVE assignment ist sill for
slight different coverage. Thus keep it distinct (for now) and mark
CVE-2018-5710 issue as well as fixed once #891869 is adressed.
The duplicated ids are CVE-2018-5729 and CVE-2018-5730.

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