Infinite loop in HAProxy - CVE-2018-20103
Published: December 14, 2018 / Updated: December 14, 2018
Vulnerability identifier: #VU16547
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-20103
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists in the dns_read_name() function, as defined in the src/dns.c source code file due to an error when processing malicious input. A remote attacker can send a specially crafted packet that submits malicious input, make a compressed pointer point to itself trigger an infinite loop and cause the affected software to crash.
Affected software
HAProxy
Arch Linux
Opensuse
Fedora
haproxy (Ubuntu package)
haproxy
rh-haproxy18-haproxy (Red Hat package)
Arch Linux
Opensuse
Fedora
haproxy (Ubuntu package)
haproxy
rh-haproxy18-haproxy (Red Hat package)
How to mitigate CVE-2018-20103
Update to version 1.18.15.
HAProxy - update to 1.8.15
haproxy (Ubuntu package) - addressed in versions 1.6.3-1ubuntu0.2, 1.8.8-1ubuntu0.3, 1.8.13-2ubuntu0.1
haproxy - addressed in versions 1.8.15-1.fc28, 1.8.15-1.fc29
rh-haproxy18-haproxy (Red Hat package) - update to 1.8.17-1.el7
haproxy (Ubuntu package) - addressed in versions 1.6.3-1ubuntu0.2, 1.8.8-1ubuntu0.3, 1.8.13-2ubuntu0.1
haproxy - addressed in versions 1.8.15-1.fc28, 1.8.15-1.fc29
rh-haproxy18-haproxy (Red Hat package) - update to 1.8.17-1.el7