Yaws Web Server 1.85 Terminal input validation

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Yaws Web Server 1.85. It has been rated as critical. The affected element is an unknown function of the component Terminal. This manipulation causes input validation. This vulnerability is handled as CVE-2009-4495. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in Yaws Web Server 1.85 (Web Server). It has been declared as critical. Affected by this vulnerability is an unknown function of the component Terminal. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality. The summary by CVE is:

Yaws 1.85 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window s title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

The weakness was released 01/13/2010 (Website). The advisory is shared at ush.it. This vulnerability is known as CVE-2009-4495 since 12/30/2009. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at packetstormsecurity.com. It is declared as proof-of-concept.

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 Exploit-DB (33502) and SecurityFocus (BID 37716†). Entries connected to this vulnerability are available at VDB-51545, VDB-51540, VDB-51539 and VDB-51537. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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OpenVAS ID: 100446
OpenVAS Name: Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/30/2009 🔍
01/11/2010 +12 days 🔍
01/13/2010 +2 days 🔍
01/13/2010 +0 days 🔍
03/18/2015 +1890 days 🔍
11/18/2025 +3898 days 🔍

Sourcesinfo

Advisory: ush.it
Status: Not defined

CVE: CVE-2009-4495 (🔍)
GCVE (CVE): GCVE-0-2009-4495
GCVE (VulDB): GCVE-100-51541
SecurityFocus: 37716 - Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability

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

Entryinfo

Created: 03/18/2015 15:15
Updated: 11/18/2025 13:59
Changes: 03/18/2015 15:15 (47), 07/15/2017 16:49 (3), 08/31/2021 09:05 (7), 06/08/2024 23:19 (22), 11/18/2025 13:59 (5)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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