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Debian Security Advisory DSA 3912-1 (heimdal - security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams reported that Heimdal, an implementation of Kerberos 5 that aims to be compatible with MIT Kerberos, trusts metadata taken from the unauthenticated plaintext (Ticket), rather than the authenticated and encrypted KDC response. A man-in-the-middle attacker can use this flaw to impersonate services to the client.
Affected Software
Affected Software
heimdal on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For the oldstable distribution (jessie), this problem has been fixed in version 1.6~rc2+dfsg-9+deb8u1. For the stable distribution (stretch), this problem has been fixed in version 7.1.0+dfsg-13+deb9u1. For the unstable distribution (sid), this problem has been fixed in version 7.4.0.dfsg.1-1. We recommend that you upgrade your heimdal packages.