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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs889685

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)wheezy1.10.1+dfsg-5+deb7u7fixed
wheezy (security)1.10.1+dfsg-5+deb7u9fixed
jessie1.12.1+dfsg-19+deb8u4vulnerable
jessie (security)1.12.1+dfsg-19+deb8u2vulnerable
stretch1.15-1+deb9u1vulnerable
buster, sid1.16-2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
krb5source(unstable)(unfixed)medium889685
krb5sourcewheezy(not affected)

Notes

[stretch] - krb5 <no-dsa> (Minor issue)
[jessie] - krb5 <no-dsa> (Minor issue)
[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.

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