VDB-15591 · CVE-2000-0491 · BID 1370

XFree86 X11r6 up to 4.0.3 xdm FORWARD_QUERY Request memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.5	$0-$5k	0.00

A vulnerability, which was classified as very critical, was found in XFree86 X11r6 up to 4.0.3. This affects some unknown functionality of the component xdm. The manipulation as part of a FORWARD_QUERY Request leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in the XDMCP parsing code of GNOME gdm, KDE kdm, and wdm allows remote attackers to execute arbitrary commands or cause a denial of service via a long FORWARD_QUERY request.

The weakness was released 05/24/2000 by Chris Evans as not defined advisory (Website). It is possible to read the advisory at ftp.calderasystems.com. This vulnerability is uniquely identified as CVE-2000-0491. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/25/2021).

The vulnerability scanner Nessus provides a plugin with the ID 13885 (Mandrake Linux Security Advisory : gdm (MDKSA-2001:070)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Mandriva Local Security Checks.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (13885). Entries connected to this vulnerability are available at VDB-2613, VDB-20153 and VDB-97343.

Productinfo

Vendor

XFree86

Name

X11r6

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 13885
Nessus Name: Mandrake Linux Security Advisory : gdm (MDKSA-2001:070)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/24/2000 🔍
05/24/2000 +0 days 🔍
06/19/2000 +26 days 🔍
06/24/2014 +5118 days 🔍
06/25/2021 +2558 days 🔍

Sourcesinfo

Advisory: ftp.calderasystems.com
Researcher: Chris Evans
Status: Not defined

CVE: CVE-2000-0491 (🔍)
SecurityFocus: 1370

See also: 🔍

Entryinfo

Created: 06/24/2014 18:06
Updated: 06/25/2021 07:35
Changes: 06/24/2014 18:06 (52), 04/13/2017 12:26 (4), 06/25/2021 07:35 (2)
Complete: 🔍
Cache ID: 18:ED2:103