Input validation error in Symfony - CVE-2020-5255
Published: March 31, 2020
Vulnerability identifier: #VU26478
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-5255
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to Symfony sets the default Content-Type header based on received Accept header. A remote attacker can pass specially crafted HTTP request and force the application to cache an empty response, leading to denial of service condition.
Affected software
Symfony
Fedora
php-symfony4
Fedora
php-symfony4
How to mitigate CVE-2020-5255
Install updates from vendor's website.
Symfony - addressed in versions 4.4.7, 5.0.7
php-symfony4 - update to 4.4.7-1.fc32
php-symfony4 - update to 4.4.7-1.fc32