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TITLE:
UMN Gopher "VIfromLine()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA16614

VERIFY ADVISORY:
http://secunia.com/advisories/16614/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
UMN Gopher 3.x
http://secunia.com/product/1860/

DESCRIPTION:
vade79 has discovered a vulnerability in Gopher client, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the
"VIfromLine()" function when copying an input line to a stack buffer.
This can be exploited to cause a stack-based buffer overflow via an
overly long "+VIEWS:" reply from the server.

Successful exploitation requires that a user e.g. is tricked into
connecting to a malicious Gopher server.

The vulnerability has been confirmed in version 3.0.9. Other versions
may also be affected.

SOLUTION:
Connect to trusted Gopher servers only.

PROVIDED AND/OR DISCOVERED BY:
vade79

ORIGINAL ADVISORY:
http://www.fakehalo.us/xgopher-client.c

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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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