CVE-2019-12147 : Vulnerability Insights and Analysis

Sangoma Session Border Controller (SBC) 2.3.23-119 GA is vulnerable to Argument Injection through special characters in the username field, allowing unauthorized users to create a local system user with sudo privileges.

Understanding CVE-2019-12147

This CVE highlights a security risk in Sangoma SBC that could lead to the compromise of the device by creating a privileged user.

What is CVE-2019-12147?

The vulnerability in Sangoma SBC allows an external user without authentication to exploit special characters in the username field, resulting in the creation of a local system user with elevated privileges.

The Impact of CVE-2019-12147

Successful exploitation of this vulnerability can enable an attacker to fully compromise the device by creating a user with sudo privileges, leading to unauthorized access and potential system control.

Technical Details of CVE-2019-12147

Sangoma SBC's vulnerability and its implications are detailed below.

Vulnerability Description

The web interface of Sangoma SBC 2.3.23-119 GA is susceptible to Argument Injection through the username field, allowing unauthorized users to create a local system user with sudo privileges.

Affected Systems and Versions

Sangoma Session Border Controller (SBC) 2.3.23-119 GA

Exploitation Mechanism

Special characters in the username field can be exploited to create a local system user with sudo privileges.
The affected files are /var/webconfig/gui/Webconfig.inc.php and /usr/local/sng/bin/sng-user-mgmt.

Mitigation and Prevention

Protecting systems from CVE-2019-12147 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Sangoma SBC to a patched version that addresses the vulnerability.
Monitor system logs for any suspicious activities related to user creation.

Long-Term Security Practices

Implement strong password policies to prevent unauthorized user creation.
Regularly audit and review user accounts and privileges to ensure security.

Patching and Updates

Apply security patches provided by Sangoma to mitigate the vulnerability and enhance system security.