CVE-2020-15094

Description

In Symfony before versions 4.4.13 and 5.1.5, the CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible. This has been fixed in versions 4.4.13 and 5.1.5.

How to fix CVE-2020-15094

To remediate CVE-2020-15094, upgrade the affected package to a fixed version below.

• —upgrade to 4.4.13 or later
• —upgrade to 4.4.13+dfsg-1 or later
• —upgrade to 4.4.13 or later
• —upgrade to 4.4.13 or later

Is CVE-2020-15094 being exploited?

Low — EPSS is 2.2%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• >= 4.4.0, < 4.4.13, >= 5.1.0, < 5.1.5
• from 0, < 4.4.13+dfsg-1
• >= 4.3.0, < 4.4.13
• >= 4.3.0, < 4.4.13

CVSS scores

References (14)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-15094
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-15094
• PATCHgithub.com/symfony/symfony
• WEBgithub.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2020-15094.yaml