HAProxy CVE-2019-19330 CRLF Injection Vulnerability

Description

HAProxy is prone to a CRLF-injection vulnerability. An attacker can exploit this issue to add arbitrary headers to a webpage. This may aid in further attacks. HAProxy versions prior to 2.0.10 are vulnerable.

Technologies Affected

• haproxy haproxy 1.4
• haproxy haproxy 1.4.0
• haproxy haproxy 1.4.1
• haproxy haproxy 1.4.10
• haproxy haproxy 1.4.11
• haproxy haproxy 1.4.12
• haproxy haproxy 1.4.13
• haproxy haproxy 1.4.14
• haproxy haproxy 1.4.15
• haproxy haproxy 1.4.16
• haproxy haproxy 1.4.17
• haproxy haproxy 1.4.18
• haproxy haproxy 1.4.19
• haproxy haproxy 1.4.2
• haproxy haproxy 1.4.20
• haproxy haproxy 1.4.21
• haproxy haproxy 1.4.22
• haproxy haproxy 1.4.23
• haproxy haproxy 1.4.24
• haproxy haproxy 1.4.3
• haproxy haproxy 1.4.4
• haproxy haproxy 1.4.5
• haproxy haproxy 1.4.6
• haproxy haproxy 1.4.7
• haproxy haproxy 1.4.8
• haproxy haproxy 1.4.9
• haproxy haproxy 1.5
• haproxy haproxy 1.5.14
• haproxy haproxy 1.5.4
• haproxy haproxy 1.6.0
• haproxy haproxy 1.6.1
• haproxy haproxy 1.6.2
• haproxy haproxy 1.6.3
• haproxy haproxy 1.6.4
• haproxy haproxy 1.6.5
• haproxy haproxy 1.6.6
• haproxy haproxy 1.7.0
• haproxy haproxy 1.8.0
• haproxy haproxy 1.8.1
• haproxy haproxy 1.8.10
• haproxy haproxy 1.8.11
• haproxy haproxy 1.8.12
• haproxy haproxy 1.8.13
• haproxy haproxy 1.8.14
• haproxy haproxy 1.8.15
• haproxy haproxy 1.8.16
• haproxy haproxy 1.8.17
• haproxy haproxy 1.8.2
• haproxy haproxy 1.8.3
• haproxy haproxy 1.8.4
• haproxy haproxy 1.8.5
• haproxy haproxy 1.8.6
• haproxy haproxy 1.8.7
• haproxy haproxy 1.8.8
• haproxy haproxy 1.8.9
• haproxy haproxy 1.9.0
• haproxy haproxy 1.9.1
• haproxy haproxy 1.9.2
• haproxy haproxy 1.9.3
• haproxy haproxy 1.9.4
• haproxy haproxy 1.9.5
• haproxy haproxy 1.9.6
• haproxy haproxy 1.9.7
• haproxy haproxy 1.9.8
• haproxy haproxy 1.9.9
• haproxy haproxy 2.0.0
• haproxy haproxy 2.0.1
• haproxy haproxy 2.0.2
• haproxy haproxy 2.0.3
• haproxy haproxy 2.0.4
• haproxy haproxy 2.0.5
• haproxy haproxy 2.0.6
• haproxy haproxy 2.0.7
• haproxy haproxy 2.0.8
• haproxy haproxy 2.0.9

Recommendations

Block external access at the network boundary, unless external parties require service.
Allow only trusted hosts and networks to connect to computers running the affected software. This will limit the potential for remote attackers to exploit this issue.

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, run all applications 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 malformed requests and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

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