FreeBSD up to 7.1 Telnet Client sys_term.c access control

CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in FreeBSD 7.0/7.0 Beta4/7.0 Releng/7.0-release/7.1. This impacts an unknown function of the file sys_term.c of the component Telnet Client. Executing a manipulation can lead to access control. This vulnerability is registered as CVE-2009-0641. Furthermore, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in FreeBSD 7.0/7.0 Beta4/7.0 Releng/7.0-release/7.1 (Operating System) and classified as critical. This vulnerability affects an unknown code block of the file sys_term.c of the component Telnet Client. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid only in older FreeBSD distributions, which might allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client, as demonstrated by an LD_PRELOAD value that references a malicious library.

The bug was discovered 02/16/2009. The weakness was published 02/20/2009 by kingcope (Website). The advisory is shared for download at security.freebsd.org. This vulnerability was named CVE-2009-0641 since 02/18/2009. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

A public exploit has been developed in ANSI C. It is possible to download the exploit at securityfocus.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 35700 (FreeBSD telnetd sys_term.c Environment Variable Handling Privilege Escalation (FreeBSD-SA-09:05)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gain a shell remotely and running in the context r.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (8055), Tenable (35700), SecurityFocus (BID 33777†), OSVDB (52315†) and Vulnerability Center (SBV-21003†). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 35700
Nessus Name: FreeBSD telnetd sys_term.c Environment Variable Handling Privilege Escalation (FreeBSD-SA-09:05)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/14/2009 🔍
02/14/2009 +0 days 🔍
02/16/2009 +2 days 🔍
02/17/2009 +1 days 🔍
02/18/2009 +1 days 🔍
02/20/2009 +2 days 🔍
02/20/2009 +0 days 🔍
02/22/2009 +2 days 🔍
03/17/2015 +2214 days 🔍
11/24/2024 +3540 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: security.freebsd.org
Researcher: kingcope
Status: Confirmed

CVE: CVE-2009-0641 (🔍)
GCVE (CVE): GCVE-0-2009-0641
GCVE (VulDB): GCVE-100-46660
X-Force: 48780
SecurityFocus: 33777 - FreeBSD 'telnetd' Daemon Remote Code Execution Vulnerability
OSVDB: 52315 - FreeBSD - 'telnetd' Daemon Remote Code Execution Issue
Vulnerability Center: 21003 - FreeBSD 7.1-STABLE, 7.0-STABLE and 7.0-RELEASE Remote Arbitrary Code Execution Vulnerability, Critical

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/17/2015 16:11
Updated: 11/24/2024 04:40
Changes: 03/17/2015 16:11 (69), 08/28/2019 07:40 (6), 08/04/2021 15:44 (3), 09/19/2024 03:13 (14), 11/24/2024 04:40 (3)
Complete: 🔍
Cache ID: 216::103

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