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.
5.3	$0-$5k	0.00

A vulnerability has been found in GNU screen up to 4.3.1 and classified as problematic. Affected by this vulnerability is the function MScrollV of the file ansi.c of the component Recursion Handler. The manipulation of the argument count with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

The MScrollV function in ansi.c in GNU screen 4.3.1 and earlier does not properly limit recursion, which allows remote attackers to cause a denial of service (stack consumption) via an escape sequence with a large repeat count value.

The weakness was presented 09/28/2015 (Website). The advisory is shared at savannah.gnu.org. This vulnerability is known as CVE-2015-6806 since 09/03/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 85807 (Debian DLA-305-1 : screen security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172428 (OpenSUSE Security Update for screen (openSUSE-SU-2019:1485-1)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (85807), SecurityFocus (BID 76703†) and Vulnerability Center (SBV-53034†).

Productinfo

Vendor

• GNU

Name

• screen

Version

• 4.3.0
• 4.3.1

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
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: 85807
Nessus Name: Debian DLA-305-1 : screen security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703352
OpenVAS Name: Debian Security Advisory DSA 3352-1 (screen - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: git.savannah.gnu.org

Timelineinfo

09/03/2015 🔍
09/04/2015 +1 days 🔍
09/04/2015 +0 days 🔍
09/28/2015 +24 days 🔍
09/28/2015 +0 days 🔍
09/29/2015 +1 days 🔍
09/30/2015 +1 days 🔍
06/19/2022 +2454 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: USN-3996-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-6806 (🔍)
OVAL: 🔍

SecurityFocus: 76703 - GNU Screen CVE-2015-6806 Stack Overflow Denial of Service Vulnerability
Vulnerability Center: 53034 - GNU screen <=4.3.1 Remote DoS Vulnerability in The MScrollV Function in ansi.c - CVE-2015-6806, Medium

Entryinfo

Created: 09/29/2015 10:22 AM
Updated: 06/19/2022 02:43 PM
Changes: 09/29/2015 10:22 AM (60), 02/01/2018 07:05 AM (11), 06/19/2022 02:40 PM (4), 06/19/2022 02:43 PM (1)
Complete: 🔍
Cache ID: 18:53D:40

Discussion

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