Out-of-bounds read in PHP - CVE-2019-9022
Published: November 1, 2019
Vulnerability identifier: #VU22477
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-9022
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition within the php_parserr in ext/standard/dns.c when processing DNS_CAA and DNS_ANY responses. A remote attacker controlling a malicious DNS server can trigger out-of-bounds read error and read contents of memory on the system.
Affected software
PHP
Red Hat Software Collections
php7 (Alpine package)
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Software Collections
php7 (Alpine package)
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
How to mitigate CVE-2019-9022
Install updates from vendor's website.
PHP - addressed in versions 7.1.26, 7.2.14, 7.3.2
php7 (Alpine package) - update to 7.2.17-r0
php7 (Alpine package) - update to 7.2.17-r0