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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.

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