Vulnerability · Published Apr 17, 2023 · Assigned by GitHub_M
CVE-2023-30536Insecure header validation in slim/psr7
Medium 6.5
In plain English
A medium-severity security flaw in Slim-Psr7 from slimphp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
slim/psr7 is a PSR-7 implementation for use with Slim 4. In versions prior to 1.6.1 an attacker could sneak in a newline (\n) into both the header names and values. While the specification states that \r\n\r\n is used to terminate the header list, many servers in the wild will also accept \n\n. An attacker that is able to control the header names that are passed to Slilm-Psr7 would be able to intentionally craft invalid messages, possibly causing application errors or invalid HTTP requests being sent out with an PSR-18 HTTP client. The latter might present a denial of service vector if a remote service’s web application firewall bans the application due to the receipt of malformed requests. The issue has been patched in version 1.6.1. There are no known workarounds to this issue. Users are advised to upgrade.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | php-slim-psr7 | 1.6.1-1 | DEBIAN-CVE-2023-30536 |
| Debian:13 | php-slim-psr7 | 1.6.1-1 | DEBIAN-CVE-2023-30536 |
| Debian:14 | php-slim-psr7 | 1.6.1-1 | DEBIAN-CVE-2023-30536 |
| Packagist | slim/psr7 | 1.5.1 | GHSA-q2qj-628g-vhfw |
| Packagist | slim/psr7 | 1.4.1 | GHSA-q2qj-628g-vhfw |
| Packagist | slim/psr7 | 1.6.1 | GHSA-q2qj-628g-vhfw |
| Ubuntu:24.04:LTS | php-slim-psr7 | no fix listed | UBUNTU-CVE-2023-30536 |
Affected products (as reported)
Weakness: CWE-436 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
References
- https://github.com/slimphp/Slim-Psr7/security/advisories/GHSA-q2qj-628g-vhfw x_refsource_CONFIRM
- https://github.com/slimphp/Slim-Psr7/commit/ed1d553225dd190875d8814c47460daed4b550bb x_refsource_MISC
- https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4 x_refsource_MISC