GHSA-6f62-3596-g6w7 CVE-2024-47220
HTTP Request Smuggling in ruby webrick
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- —
- No score published
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- Fix
1.8.2- Upgrade webrick to this version or later
Description
An issue was discovered in the WEBrick toolkit through 1.8.1 for Ruby. It allows HTTP request smuggling by providing both a Content-Length header and a Transfer-Encoding header, e.g., "GET /admin HTTP/1.1\r\n" inside of a "POST /user HTTP/1.1\r\n" request. NOTE: the supplier's position is "Webrick should not be used in production."
Affected versions
RubyGems
| Package | Vulnerable | Fixed in |
|---|---|---|
| webrick | < 1.8.2 |
1.8.2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
webrick RubyGems → 1.8.2
- bundler
bundle update webrick # Gemfile: gem "webrick", ">= 1.8.2"
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Weakness
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How to prevent it
- Implementation: Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
- Implementation: Use only SSL communication.
- Implementation: Terminate the client session after each request.
- System Configuration: Turn all pages to non-cacheable.
References
Advisories
Packages
Other links
- github.com/ruby/webrick/issues/145
- github.com/ruby/webrick/issues/145
- github.com/ruby/webrick/issues/145
- github.com/ruby/webrick/pull/146/commits/d88321da45dcd230ac2b4585cad4833d6d5e8841
- github.com/ruby/webrick/commit/f5faca9222541591e1a7c3c97552ebb0c92733c7
- github.com/rubysec/ruby-advisory-db/blob/master/gems/webrick/CVE-2024-47220.yml
Timeline
- Published
- Last updated by the source
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-r995-q44h-hr64 Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling | Medium | Also affects webrick |
| GHSA-gwfg-cqmg-cf8f WEBRick vulnerable to HTTP Request/Response Smuggling | High | Also affects webrick |
| GHSA-369m-2gv6-mw28 WEBrick RCE Vulnerability | High | Also affects webrick |
| GHSA-wfrc-r6c6-7j9r WEBrick Denial of Service Vulnerability | High | Also affects webrick |
| GHSA-6mq2-37j5-w6r6 WEBrick Improper Input Validation vulnerability | Medium | Also affects webrick |
| EEF-CVE-2026-114216 Chunk extensions accept bare LF and CR, enabling request smuggling in Bandit | Not rated yet | Same weakness, CWE-444 |
| RUSTSEC-2026-0388 Pingora HTTP/2 :authority and Host header mismatch enables cache poisoning and host-based access control bypass | Not rated yet | Same weakness, CWE-444 |
| GHSA-pqxq-w44r-73xw AIOHTTP: Pure-Python parser request smuggling | Medium | Same weakness, CWE-444 |
MergeHarbor checks every repository's dependencies against this database, ranks what matters by exploitability and reachability, routes it to the owning team and opens the fix pull request.
Check your repos with MergeHarbor