Input validation error in php7 (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-7070
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 php7 (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU47252

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-7070

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists in the way PHP parser handles cookies with percent character (e.g. '%'). A remote attacker can send a crafted HTTP request with a `__%48ost-` or `__%53ecure-` cookie that will be processed before other cookies sent in the same request. As a result, an attacker can set malicious `__Host-` cookie on a subdomain and bypass origin restrictions, imposed by browsers.

Successful exploitation of the vulnerability may allow an attacker to perform a spoofing attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.2.5-r0 - 7.4.10-r2

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=fea14b992879a919d81e6500b16721f9ecf084b7


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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