EUVD-2025-19113
GHSA-r995-q44h-hr64
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Description
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
Analysis
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions.
The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
Technical Context
This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444).
Affected Products
Affected products: Ruby-Lang Webrick
Remediation
A vendor patch is available. Apply it as soon as possible and verify the fix.
Priority Score
Vendor Status
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| oracular | ignored | end of life, was needs-triage |
| upstream | released | 1.9.1-1 |
| jammy | released | 1.7.0-3ubuntu0.2 |
| noble | released | 1.8.1-1ubuntu0.2 |
| plucky | released | 1.8.1-1ubuntu1.1 |
| questing | released | 1.9.1-1 |
| Release | Status | Version |
|---|---|---|
| trusty | needed | - |
| xenial | needed | - |
| bionic | needed | - |
| focal | needed | - |
| jammy | DNE | - |
| noble | not-affected | vulnerable code not present |
| plucky | not-affected | vulnerable code not present |
| questing | not-affected | vulnerable code not present |
| upstream | needs-triage | - |
| Release | Status | Version |
|---|---|---|
| jammy | DNE | - |
| noble | DNE | - |
| plucky | DNE | - |
| questing | DNE | - |
| upstream | needs-triage | - |
| xenial | released | 2.3.1-2~ubuntu16.04.16+esm11 |
| Release | Status | Version |
|---|---|---|
| jammy | DNE | - |
| noble | DNE | - |
| plucky | DNE | - |
| questing | DNE | - |
| upstream | needs-triage | - |
| bionic | released | 2.5.1-1ubuntu1.16+esm6 |
| Release | Status | Version |
|---|---|---|
| jammy | DNE | - |
| noble | DNE | - |
| plucky | DNE | - |
| questing | DNE | - |
| upstream | needs-triage | - |
| focal | released | 2.7.0-5ubuntu1.18+esm3 |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bookworm | vulnerable | 1.8.1-1 | - |
| trixie | fixed | 1.9.1-1 | - |
| forky, sid | fixed | 1.9.2-1 | - |
| (unstable) | fixed | 1.9.1-1 | - |
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External POC / Exploit Code
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