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TITLE:
Kerberos V5 Telnet Client Information Disclosure Weakness

SECUNIA ADVISORY ID:
SA15709

VERIFY ADVISORY:
http://secunia.com/advisories/15709/

CRITICAL:
Not critical

IMPACT:
Exposure of system information

WHERE:
>From remote

SOFTWARE:
Kerberos V5
http://secunia.com/product/556/

DESCRIPTION:
Gaël Delalleau has reported a weakness in Kerberos V5, which can be
exploited by malicious people to gain knowledge of various
information.

The problem is caused due to a design error in the Telnet client when
handling the NEW-ENVIRON command. This can be exploited to gain
knowledge of the session variables for a user, who has an open
connection to a malicious Telnet server.

The weakness has been reported in the telnet client included in the
Kerberos V5 Release 1.3.6 package.  Other versions may also be
affected.

SOLUTION:
The vendor is reportedly considering to release patches, which
implement an option to restrict or disable the transmission of
environment variables by the telnet client.

PROVIDED AND/OR DISCOVERED BY:
Gaël Delalleau

ORIGINAL ADVISORY:
iDEFENSE:
http://www.idefense.com/application/poi/display?id=260&type=vulnerabilities

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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