Debian Security Advisory

DLA-1265-1 krb5 -- LTS security update

Date Reported:
31 Jan 2018
Affected Packages:
krb5
Vulnerable:
Yes
Security database references:
In the Debian bugtracking system: Bug 728845, Bug 762479, Bug 773226, Bug 778647, Bug 819468, Bug 832572.
In Mitre's CVE dictionary: CVE-2013-1418, CVE-2014-5351, CVE-2014-5353, CVE-2014-5355, CVE-2016-3119, CVE-2016-3120.
More information:

Kerberos, a system for authenticating users and services on a network, was affected by several vulnerabilities. The Common Vulnerabilities and Exposures project identifies the following issues.

  • CVE-2013-1418

    Kerberos allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted request when multiple realms are configured.

  • CVE-2014-5351

    Kerberos sends old keys in a response to a -randkey -keepold request, which allows remote authenticated users to forge tickets by leveraging administrative access.

  • CVE-2014-5353

    When the KDC uses LDAP, allows remote authenticated users to cause a denial of service (daemon crash) via a successful LDAP query with no results, as demonstrated by using an incorrect object type for a password policy.

  • CVE-2014-5355

    Kerberos expects that a krb5_read_message data field is represented as a string ending with a '\0' character, which allows remote attackers to (1) cause a denial of service (NULL pointer dereference) via a zero-byte version string or (2) cause a denial of service (out-of-bounds read) by omitting the '\0' character,

  • CVE-2016-3119

    Kerberos allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted request to modify a principal.

  • CVE-2016-3120

    Kerberos allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

For Debian 7 Wheezy, these problems have been fixed in version 1.10.1+dfsg-5+deb7u9.

We recommend that you upgrade your krb5 packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS