CVE-2023-30536 Insecure header validation in slim/psr7

2023-04-1721:17:33

CWE-436

GitHub_M

www.cve.org

insecure header validation

slim/psr7

cve-2023-30536

psr-7 implementation

version 1.6.1 patch

denial of service

web application firewall

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

6.9 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

32.4%

JSON

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.

CNA Affected

[
  {
    "vendor": "slimphp",
    "product": "Slim-Psr7",
    "versions": [
      {
        "version": "< 1.6.1",
        "status": "affected"
      }
    ]
  }
]