CVE-2018-5709

NameCVE-2018-5709
DescriptionAn issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.
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 Bugs889684

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)wheezy1.10.1+dfsg-5+deb7u7vulnerable
wheezy (security)1.10.1+dfsg-5+deb7u9vulnerable
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)unimportant889684

Notes

https://github.com/poojamnit/Kerberos-V5-1.16-Vulnerabilities/tree/master/Integer%20Overflow
non-issue, codepath is only run on trusted input, potential integer
overflow is non-issue

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