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CVE-2015-2694

Status Candidate

Overview

The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.

Related Files

Red Hat Security Advisory 2015-2154-07
Posted Nov 20, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-2154-07 - Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center. It was found that the krb5_read_message() function of MIT Kerberos did not correctly sanitize input, and could create invalid krb5_data objects. A remote, unauthenticated attacker could use this flaw to crash a Kerberos child process via a specially crafted request.

tags | advisory, remote
systems | linux, redhat
advisories | CVE-2014-5355, CVE-2015-2694
SHA-256 | 5ad980f4c68fede003281d3f75b3cf69921e4939654d38992cb7f8254c273b7d
Ubuntu Security Notice USN-2810-1
Posted Nov 12, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2810-1 - It was discovered that the Kerberos kpasswd service incorrectly handled certain UDP packets. A remote attacker could possibly use this issue to cause resource consumption, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS. It was discovered that Kerberos incorrectly handled null bytes in certain data fields. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Various other issues were also addressed.

tags | advisory, remote, denial of service, udp
systems | linux, ubuntu
advisories | CVE-2002-2443, CVE-2014-5355, CVE-2015-2694, CVE-2015-2695, CVE-2015-2696, CVE-2015-2697, CVE-2015-2698
SHA-256 | 54cd41e88f3b572fc0172f18b2a69d4bc309121aab39e9d9df3fcb5f00087252
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