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TITLE:
Heimdal telnetd Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA47399

VERIFY ADVISORY:
Secunia.com
https://secunia.com/advisories/47399/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47399

RELEASE DATE:
2011-12-26

DISCUSS ADVISORY:
https://secunia.com/advisories/47399/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Criticality Level
 * Impact
 * Where
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 * Operating System / Software
 * CVE Reference(s)

https://secunia.com/advisories/47399/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=47399

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
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https://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
A vulnerability has been reported in Heimdal, which can be exploited
by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the
"encrypt_keyid()" function (appl/telnet/libtelnet/encrypt.c) of
telnetd, which can be exploited to cause a buffer overflow by sending
specially crafted commands to the server.

This is related to:
SA47397

The vulnerability is confirmed in version 1.5.1. Other versions may
also be affected.

SOLUTION:
Restrict access to trusted hosts only.

PROVIDED AND/OR DISCOVERED BY:
Originally reported in the FreeBSD telnetd service.

OTHER REFERENCES:
Further details available in Customer Area:
https://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
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EXTENDED DESCRIPTION:
Further details available in Customer Area:
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EXTENDED SOLUTION:
Further details available in Customer Area:
https://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
https://secunia.com/vulnerability_intelligence/

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

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