Liblouis utils.c _lou_showString 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.

A vulnerability was found in Liblouis 3.2.0. It has been declared as critical. Affected by this vulnerability is the function _lou_showString of the file utils.c. The manipulation 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 confidentiality, integrity, and availability. The summary by CVE is:

There is a buffer overflow in Liblouis 3.2.0, triggered in the function _lou_showString() in utils.c, that will lead to a remote denial of service attack.

The bug was discovered 08/29/2017. The weakness was disclosed 08/29/2017 (Website). The advisory is shared at This vulnerability is known as CVE-2017-13743 since 08/29/2017. 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 103528 (SUSE SLED12 / SLES12 Security Update : liblouis (SUSE-SU-2017:2570-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170411 (OpenSUSE Security Update for liblouis (openSUSE-SU-2017:2639-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (103528). The entries 105932, 105933, 105934 and 105935 are pretty similar.




CPE 2.3info

CPE 2.2info


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


VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍



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

NVD Base Score: 🔍


Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 103528
Nessus Name: SUSE SLED12 / SLES12 Security Update : liblouis (SUSE-SU-2017:2570-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 64337
OpenVAS Name: CentOS Update for liblouis CESA-2017:3111 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

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


08/29/2017 🔍
08/29/2017 +0 days 🔍
08/29/2017 +0 days 🔍
08/29/2017 +0 days 🔍
08/29/2017 +0 days 🔍
08/30/2017 +1 days 🔍
09/26/2017 +27 days 🔍
09/28/2017 +2 days 🔍
12/27/2022 +1916 days 🔍


Advisory: RHSA-2017:3111
Status: Not defined

CVE: CVE-2017-13743 (🔍)
SecurityFocus: 100607 - Liblouis Multiple Security Vulnerabilities

See also: 🔍


Created: 08/30/2017 08:56 AM
Updated: 12/27/2022 08:49 AM
Changes: 08/30/2017 08:56 AM (67), 11/11/2019 05:57 PM (11), 12/27/2022 08:49 AM (4)
Complete: 🔍


No comments yet. Languages: en.

Please log in to comment.

Might our Artificial Intelligence support you?

Check our Alexa App!