libgd CVE-2019-6978 Double Free Multiple Denial of Service Vulnerabilities

Description

libgd is prone to multiple denial-of-service vulnerabilities. Attackers can exploit these issues to cause a denial-of-service condition. libgd version 2.2.5 is vulnerable; other versions may also be affected.

Technologies Affected

• LibGD LibGD 2.1.0
• LibGD LibGD 2.1.1
• LibGD LibGD 2.2.0
• LibGD LibGD 2.2.1
• LibGD LibGD 2.2.3
• LibGD LibGD 2.2.4
• LibGD LibGD 2.2.5
• Redhat CodeReady Linux Builder for ARM 64 8
• Redhat CodeReady Linux Builder for IBM z Systems 8
• Redhat CodeReady Linux Builder for Power little endian 8
• Redhat CodeReady Linux Builder for x86_64 8
• Redhat Enterprise Linux 5
• Redhat Enterprise Linux 6
• Redhat Enterprise Linux 7
• Redhat Enterprise Linux for ARM 64 8
• Redhat Enterprise Linux for IBM z Systems 8
• Redhat Enterprise Linux for Power little endian 8
• Redhat Enterprise Linux for x86_64 8
• Ubuntu Ubuntu Linux 14.04 LTS
• Ubuntu Ubuntu Linux 16.04 LTS
• Ubuntu Ubuntu Linux 18.04 LTS
• Ubuntu Ubuntu Linux 18.10

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

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.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

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