CVE-2021-43617

EPSS 19.8%

Vexday Risk Score

28Low

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Popular PoC on GitHub (1 stars) — exploitation code widely available.

CVSS —EPSS 19.8%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

14 Nov 2021Published on NVD

15 Nov 2021Public PoC

Weaponization speed

same dayto first PoC

Weaponized quickly — attackers prioritized this vulnerability. Patch urgently.

Recommendation: Plan a near-term fix — a public PoC already exists.

Laravel Framework through 8.70.2 does not sufficiently block the upload of executable PHP content because Illuminate/Validation/Concerns/ValidatesAttributes.php lacks a check for .phar files, which are handled as application/x-httpd-php on systems based on Debian. NOTE: this CVE Record is for Laravel Framework, and is unrelated to any reports concerning incorrectly written user applications for image upload.

Affected products

n/a · n/a

public PoCs found — 4

githubgithub.com/Sybelle03/CVE-2021-43617★ 1 githubgithub.com/kombat1/CVE-2021-43617★ 0 githubgithub.com/aweiiy/CVE-2021-43617★ 0 exploitdbwww.exploit-db.com/exploits/50525unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

https://github.com/laravel/framework/blob/2049de73aa099a113a287587df4cc522c90961f5/src/Illuminate/Validation/Concerns/ValidatesAttributes.php#L1331-L1333 https://salsa.debian.org/php-team/php/-/blob/dc253886b5b2e9bc8d9e36db787abb083a667fd8/debian/php-cgi.conf#L5-6 https://salsa.debian.org/php-team/php/-/commit/dc253886b5b2e9bc8d9e36db787abb083a667fd8