CVE-2020-7070

Public Exploit
PHP parses encoded cookie names so malicious `__Host-` cookies can be sent

Description

In PHP versions 7.2.x below 7.2.34, 7.3.x below 7.3.23 and 7.4.x below 7.4.11, when PHP is processing incoming HTTP cookie values, the cookie names are url-decoded. This may lead to cookies with prefixes like __Host confused with cookies that decode to such prefix, thus leading to an attacker being able to forge cookie which is supposed to be secure. See also CVE-2020-8184 for more information.

Categories

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 22.89% Top 5%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory php.net
Affected: PHP Group PHP
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/895727 third party advisory exploit
https://bugs.php.net/bug.php?id=79699 vendor advisory issue tracking
http://cve.circl.lu/cve/CVE-2020-8184 third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRU57N3OSYZPOMFWPRDNVH7EMYOTSZ66/ vendor advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00008.html third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EVDN7D3IB4EAI4D3ZOM2OJKQ5SD7K4E/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2J3ZZDHCSX65T5QWV4AHBN7MOJXBEKG/ vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00045.html vendor advisory mailing list third party advisory
https://usn.ubuntu.com/4583-1/ third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00067.html vendor advisory mailing list third party advisory
https://security.gentoo.org/glsa/202012-16 third party advisory vendor advisory
https://www.debian.org/security/2021/dsa-4856 third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20201016-0001/ third party advisory
https://www.oracle.com/security-alerts/cpuoct2021.html third party advisory not applicable
https://www.tenable.com/security/tns-2021-14 third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-7070?
CVE-2020-7070 has been scored as a medium severity vulnerability.
How to fix CVE-2020-7070?
To fix CVE-2020-7070, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-7070 being actively exploited in the wild?
It is possible that CVE-2020-7070 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~23% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-7070?
CVE-2020-7070 affects PHP Group PHP.
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