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

high Nessus Plugin ID 20487

Synopsis

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

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.
(CAN-2004-0911).

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.

Plugin Details

Severity: High

ID: 20487

File Name: ubuntu_USN-101-1.nasl

Version: 1.15

Type: local

Agent: unix

Published: 1/15/2006

Updated: 1/19/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:telnet, cpe:/o:canonical:ubuntu_linux:4.10, p-cpe:/a:canonical:ubuntu_linux:telnetd

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Patch Publication Date: 3/28/2005

Reference Information

CVE: CVE-2004-0911, CVE-2005-0469

USN: 101-1