FreeBSD : krb5 -- multiple checksum handling vulnerabilities (11bbccbc-03ee-11e0-bcdb-001fc61c2a55)

Low Nessus Plugin ID 51101


The remote FreeBSD host is missing one or more security-related updates.


The MIT Kerberos team reports :

MIT krb5 clients incorrectly accept an unkeyed checksums in the SAM-2 preauthentication challenge.

An unauthenticated remote attacker could alter a SAM-2 challenge, affecting the prompt text seen by the user or the kind of response sent to the KDC. Under some circumstances, this can negate the incremental security benefit of using a single-use authentication mechanism token.

MIT krb5 incorrectly accepts RFC 3961 key-derivation checksums using RC4 keys when verifying KRB-SAFE messages.

An unauthenticated remote attacker has a 1/256 chance of forging KRB-SAFE messages in an application protocol if the targeted pre-existing session uses an RC4 session key. Few application protocols use KRB-SAFE messages.


Update the affected packages.

See Also

Plugin Details

Severity: Low

ID: 51101

File Name: freebsd_pkg_11bbccbc03ee11e0bcdb001fc61c2a55.nasl

Version: $Revision: 1.11 $

Type: local

Published: 2010/12/10

Modified: 2016/12/08

Dependencies: 12634

Risk Information

Risk Factor: Low


Base Score: 2.6

Temporal Score: 2

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C


Base Score: 3.7

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:krb5, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2010/12/09

Vulnerability Publication Date: 2010/11/30

Reference Information

CVE: CVE-2010-1323

BID: 45118

OSVDB: 69610