Libsixel CVE-2019-20205 Integer Overflow Vulnerability

Description

Libsixel is prone to an integer overflow vulnerability. Attackers can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts will likely cause a denial-of-service condition. Libsixel versions through 1.8.4 are vulnerable.

Technologies Affected

• Libsixel Libsixel 1.0.0
• Libsixel Libsixel 1.1.0
• Libsixel Libsixel 1.2.0
• Libsixel Libsixel 1.3.0
• Libsixel Libsixel 1.4.0
• Libsixel Libsixel 1.5.0
• Libsixel Libsixel 1.5.1
• Libsixel Libsixel 1.5.2
• Libsixel Libsixel 1.5.3
• Libsixel Libsixel 1.6.0
• Libsixel Libsixel 1.6.1
• Libsixel Libsixel 1.7.1
• Libsixel Libsixel 1.7.2
• Libsixel Libsixel 1.7.3
• Libsixel Libsixel 1.8.0
• Libsixel Libsixel 1.8.1
• Libsixel Libsixel 1.8.2
• Libsixel Libsixel 1.8.3
• Libsixel Libsixel 1.8.4

Recommendations

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, run the application with the minimal amount of privileges required for functionality.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from a successful exploit.

Do not accept or execute files from untrusted or unknown sources.
To reduce the likelihood of successful exploits, never handle files that originate from unfamiliar or untrusted sources.

Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker’s ability to exploit this vulnerability to execute arbitrary code.

Updates are available. Please see the references or vendor advisory for more information.