CVE-2024-39316 Rack ReDoS Vulnerability in HTTP Accept Headers Parsing

2024-07-0215:57:39

CWE-1333

GitHub_M

github.com

rack

ruby

http

redos

vulnerability

accept headers

denial of service

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

Rack is a modular Ruby web server interface. Starting in version 3.1.0 and prior to version 3.1.5, Regular Expression Denial of Service (ReDoS) vulnerability exists in the Rack::Request::Helpers module when parsing HTTP Accept headers. This vulnerability can be exploited by an attacker sending specially crafted Accept-Encoding or Accept-Language headers, causing the server to spend excessive time processing the request and leading to a Denial of Service (DoS). The fix for CVE-2024-26146 was not applied to the main branch and thus while the issue was fixed for the Rack v3.0 release series, it was not fixed in the v3.1 release series until v3.1.5. Users of versions on the 3.1 branch should upgrade to version 3.1.5 to receive the fix.

CNA Affected

[
  {
    "vendor": "rack",
    "product": "rack",
    "versions": [
      {
        "status": "affected",
        "version": ">= 3.1.0, < 3.1.5"
      }
    ]
  }
]