GNU screen 4.0.2 encoding.c utf8_handle_comb denial of service

CVSS Meta Temp Score
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CTI Interest Score
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3.4$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in GNU screen 4.0.2. Affected is the function utf8_handle_comb of the file encoding.c. This manipulation causes denial of service. This vulnerability is handled as CVE-2006-4573. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in GNU screen 4.0.2. It has been declared as problematic. Affected by this vulnerability is the function utf8_handle_comb of the file encoding.c. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Multiple unspecified vulnerabilities in the "utf8 combining characters handling" (utf8_handle_comb function in encoding.c) in screen before 4.0.3 allows user-assisted attackers to cause a denial of service (crash or hang) via certain UTF8 sequences.

The bug was discovered 10/25/2006. The weakness was released 10/24/2006 by Rich Felker (Website). It is possible to read the advisory at lists.gnu.org. This vulnerability is known as CVE-2006-4573 since 09/06/2006. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 22925 (FreeBSD : screen -- combined UTF-8 characters vulnerability (b318dc8c-6756-11db-83c3-000c6ec775d9)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115560 (Apple Mac OS X Security Update 2007-005 Not Installed (APPLE-SA-2007-05-24)).

Upgrading to version 4.0.3 eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (29784), Tenable (22925), SecurityFocus (BID 20727†), OSVDB (29905†) and Secunia (SA22583†). Entries connected to this vulnerability are available at VDB-33639, VDB-33002, VDB-34611 and VDB-36980. Be aware that VulDB is the high quality 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: 3.7
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 22925
Nessus Name: FreeBSD : screen -- combined UTF-8 characters vulnerability (b318dc8c-6756-11db-83c3-000c6ec775d9)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 57564
OpenVAS Name: Debian Security Advisory DSA 1202-1 (screen)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: screen 4.0.3

Timelineinfo

09/06/2006 🔍
10/24/2006 +48 days 🔍
10/24/2006 +0 days 🔍
10/24/2006 +0 days 🔍
10/25/2006 +1 days 🔍
10/25/2006 +0 days 🔍
10/29/2006 +4 days 🔍
10/30/2006 +1 days 🔍
11/05/2006 +6 days 🔍
03/12/2015 +3049 days 🔍
07/10/2019 +1581 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: lists.gnu.org
Researcher: Rich Felker
Status: Not defined
Confirmation: 🔍

CVE: CVE-2006-4573 (🔍)
GCVE (CVE): GCVE-0-2006-4573
GCVE (VulDB): GCVE-100-32911
X-Force: 29784
SecurityFocus: 20727 - GNU Screen Multiple Denial of Service Vulnerabilities
Secunia: 22583
OSVDB: 29905 - CVE-2006-4573 - GNU - screen - Multiple Unspecified Issues
Vulnerability Center: 13047 - Gnu Screen User-Assisted Denial of Service Due to Vulnerabilities in utf8_handle_comb Function, Medium
Vupen: ADV-2006-4189

See also: 🔍

Entryinfo

Created: 03/12/2015 22:21
Updated: 07/10/2019 14:59
Changes: 03/12/2015 22:21 (77), 07/10/2019 14:59 (8)
Complete: 🔍
Cache ID: 216:B6B:103

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