X.org X11 X Font Server swap_char2b numeric error

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in X.org X11. The affected element is the function swap_char2b of the component X Font Server. This manipulation causes numeric error. This vulnerability is handled as CVE-2007-4990. Additionally, an exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in X.org X11 (Windowing System Software) (affected version unknown) and classified as problematic. Affected by this vulnerability is the function swap_char2b of the component X Font Server. The manipulation with an unknown input leads to a numeric error vulnerability. The CWE definition for the vulnerability is CWE-189. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The swap_char2b function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.

The bug was discovered 10/02/2007. The weakness was released 10/03/2007 by Sean Larsson with iDefense (Website). The advisory is shared at labs.idefense.com. This vulnerability is known as CVE-2007-4990 since 09/19/2007. The attack can only be done within the local network. The exploitation doesn't need any form of authentication. Technical details and also a exploit are known.

It is possible to download the exploit at immunitysec.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 $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 30046 (HP-UX PHSS_37225 : HP-UX Running X Font Server (xfs) Software, Remote Execution of Arbitrary Code (HPSBUX02303 SSRT071468 rev.1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family HP-UX Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 117368 (CentOS Security Update for xorg (CESA-2008:0030)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at lists.freedesktop.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 4 months after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8987.

The vulnerability is also documented in the databases at X-Force (36920), Tenable (30046), SecurityFocus (BID 25898†), OSVDB (37722†) and Secunia (SA28514†). Entries connected to this vulnerability are available at VDB-82, VDB-332, VDB-333 and VDB-427. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.5

VulDB Base Score: 6.3
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Numeric error
CWE: CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 30046
Nessus Name: HP-UX PHSS_37225 : HP-UX Running X Font Server (xfs) Software, Remote Execution of Arbitrary Code (HPSBUX02303 SSRT071468 rev.1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 880063
OpenVAS Name: Centreon command_name Parameter Remote Command Execution Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: lists.freedesktop.org
TippingPoint: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍

Timelineinfo

09/19/2007 🔍
10/02/2007 +13 days 🔍
10/02/2007 +0 days 🔍
10/02/2007 +0 days 🔍
10/03/2007 +1 days 🔍
10/03/2007 +0 days 🔍
10/05/2007 +2 days 🔍
10/11/2007 +6 days 🔍
10/18/2007 +6 days 🔍
10/25/2007 +7 days 🔍
01/14/2008 +81 days 🔍
01/16/2008 +2 days 🔍
01/22/2008 +6 days 🔍
07/29/2019 +4206 days 🔍

Sourcesinfo

Vendor: x.org

Advisory: labs.idefense.com⛔
Researcher: Sean Larsson
Organization: iDefense
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2007-4990 (🔍)
GCVE (CVE): GCVE-0-2007-4990
GCVE (VulDB): GCVE-100-3361

OVAL: 🔍

X-Force: 36920 - X.Org XFS QueryXBitmaps and QueryXExtents buffer overflow, High Risk
SecurityFocus: 25898 - X.Org X Font Server Multiple Memory Corruption Vulnerabilities
Secunia: 28514
OSVDB: 37722 - X.Org X Font Server (xfs) swap_char2b Function Arbitrary Code Execution
SecurityTracker: 1018763
Vulnerability Center: 16653 - X.Org X Font Server Swap_char2b Function Allows Remote Code Execution, High
Vupen: ADV-2008-0149

See also: 🔍

Entryinfo

Created: 10/18/2007 09:48
Updated: 07/29/2019 09:21
Changes: 10/18/2007 09:48 (105), 07/29/2019 09:21 (3)
Complete: 🔍
Cache ID: 216:089:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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