PT-2023-22763 · Slim+1 · Slim/Psr7+1
Grahamcampbell
·
Published
2023-04-17
·
Updated
2025-03-03
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CVE-2023-30536
CVSS v3.1
6.5
Medium
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
Name of the Vulnerable Software and Affected Versions
slim/psr7 versions prior to 1.6.1
Description
The issue allows an attacker to sneak in a newline (
) into both the header names and values. Although the specification states that r r is used to terminate the header list, many servers also accept ``. This could enable an attacker to craft invalid messages, potentially causing application errors or invalid HTTP requests being sent out with a 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.
Recommendations
For versions prior to 1.6.1, upgrade to version 1.6.1 to resolve the issue. As a temporary workaround, consider restricting the input of header names to prevent the introduction of newlines (
) until the upgrade is applied.Exploit
Fix
DoS
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Slim/Psr7