Ubuntu 4.10 : netkit-telnet vulnerabilities (USN-101-1)

Ubuntu Security Notice (C) 2005-2016 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.

Synopsis :

The remote Ubuntu host is missing one or more security-related

Description :

A buffer overflow was discovered in the telnet client's handling of
the LINEMODE suboptions. By sending a specially constructed reply
containing a large number of SLC (Set Local Character) commands, a
remote attacker (i. e. a malicious telnet server) could execute
arbitrary commands with the privileges of the user running the telnet
client. (CAN-2005-0469)

Michal Zalewski discovered a Denial of Service vulnerability in the
telnet server (telnetd). A remote attacker could cause the telnetd
process to free an invalid pointer, which caused the server process to
crash, leading to a denial of service (inetd will disable the service
if telnetd crashed repeatedly), or possibly the execution of arbitrary
code with the privileges of the telnetd process (by default, the
'telnetd' user). Please note that the telnet server is not officially
supported by Ubuntu, it is in the 'universe' component.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected telnet and / or telnetd packages.

Risk factor :

High / CVSS Base Score : 7.5

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 20487 ()

Bugtraq ID:

CVE ID: CVE-2004-0911

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