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.
Published 2023-04-17 22:15:10
Updated 2023-05-01 16:38:35
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2023-30536

0.07%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 28 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-30536

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.9
2.5
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.9
2.5
GitHub, Inc.

CWE ids for CVE-2023-30536

  • Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2023-30536

Products affected by CVE-2023-30536

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