[Secure-testing-team] Bug#889684: krb5: CVE-2018-5709

[Salvatore Bonaccorso]

Source: krb5
Version: 1.16-2
Severity: important
Tags: security upstream

Hi,

the following vulnerability was published for krb5, filling a bug to
track the issue once more details are available.

CVE-2018-5709[0]:
| An 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.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-5709
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5709

Please adjust the affected versions in the BTS as needed, once known.

Regards,
Salvatore