Out-of-bounds read in PHP - CVE-2019-9638
Published: November 1, 2019
Vulnerability identifier: #VU22480
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-2019-9638
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 in the EXIF component within exif_process_IFD_in_MAKERNOTE when converting maker_note->offset relationship to value_len. A remote attacker can trigger an 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 Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Flex System Chassis Management Module (CMM)
Red Hat Software Collections
php7 (Alpine package)
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Flex System Chassis Management Module (CMM)
How to mitigate CVE-2019-9638
Install updates from vendor's website.
PHP - addressed in versions 7.1.27, 7.2.16, 7.3.3
php7 (Alpine package) - addressed in versions 7.1.30-r0, 7.2.17-r0
Flex System Chassis Management Module (CMM) - update to 2pet18c-2.5.16c
php7 (Alpine package) - addressed in versions 7.1.30-r0, 7.2.17-r0
Flex System Chassis Management Module (CMM) - update to 2pet18c-2.5.16c