Deserialization of Untrusted Data in Symfony - CVE-2019-18889
Published: November 19, 2019
Vulnerability identifier: #VU22853
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-18889
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in the AbstractAdapter and TagAwareAdapter instances within the Symfony Cache component. A remote attacker can pass specially crafted data to to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Symfony
symfony (Debian package)
php-symfony3
Fedora
symfony (Debian package)
php-symfony3
Fedora
How to mitigate CVE-2019-18889
Install updates from vendor's website.
Symfony - addressed in versions 2.8.52, 3.4.35, 4.2.12, 4.3.8
symfony (Debian package) - addressed in versions 2.8.7+dfsg-1.3+deb9u3, 3.4.22+dfsg-2+deb10u1
php-symfony3 - update to 3.4.35-2.fc31
symfony (Debian package) - addressed in versions 2.8.7+dfsg-1.3+deb9u3, 3.4.22+dfsg-2+deb10u1
php-symfony3 - update to 3.4.35-2.fc31