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

Quick assessment

Affected
rack rack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rack是模块化的Ruby Web服务器界面。 Rack 3.1.0版本至3.1.5之前版本存在安全漏洞，该漏洞源于存在正则表达式拒绝服务(ReDoS)漏洞，攻击者可以利用此漏洞发送特制的标头，导致服务器花费过多时间处理请求并导致拒绝服务(DoS)。

CVSS 6.5 · Medium EPSS 0.86% · P57
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I. Basic Information for CVE-2024-39316

Vulnerability Information
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Vulnerability Title
Rack ReDoS Vulnerability in HTTP Accept Headers Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Rack 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rack是模块化的Ruby Web服务器界面。 Rack 3.1.0版本至3.1.5之前版本存在安全漏洞，该漏洞源于存在正则表达式拒绝服务(ReDoS)漏洞，攻击者可以利用此漏洞发送特制的标头，导致服务器花费过多时间处理请求并导致拒绝服务(DoS)。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rack rack >= 3.1.0, < 3.1.5 -

II. Public POCs for CVE-2024-39316

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III. Intelligence Information for CVE-2024-39316

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Patches & Fixes for CVE-2024-39316 (1)

Vendor Advisories for CVE-2024-39316 (2)

IV. Related Vulnerabilities

Same product: rack
Same vendor: rack
Same weakness: CWE-1333

V. Comments for CVE-2024-39316

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