Debian Security Advisory

DSA-4455-1 heimdal -- security update

Date Reported:
03 Jun 2019
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 928966, Bug 929064.
In Mitre's CVE dictionary: CVE-2018-16860, CVE-2019-12098.
More information:

Several vulnerabilities were discovered in Heimdal, an implementation of Kerberos 5 that aims to be compatible with MIT Kerberos.

  • CVE-2018-16860

    Isaac Boukris and Andrew Bartlett discovered that Heimdal was susceptible to man-in-the-middle attacks caused by incomplete checksum validation. Details on the issue can be found in the Samba advisory at

  • CVE-2019-12098

    It was discovered that failure of verification of the PA-PKINIT-KX key exchange client-side could permit to perform man-in-the-middle attack.

For the stable distribution (stretch), these problems have been fixed in version 7.1.0+dfsg-13+deb9u3.

We recommend that you upgrade your heimdal packages.

For the detailed security status of heimdal please refer to its security tracker page at: