Vulnerability in Ruby-Lang Ruby
CVE-2019-16254
Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.046 (91.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000
Affected products
- Ruby-Lang Ruby
- Debian Linux — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hackerone.com/reports/331984 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/11/msg00025.html (Mailing List, Third Party Advisory)
- www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-201… (Vendor Advisory)
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/ (Vendor Advisory)
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/ (Vendor Advisory)
- www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/ (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2019/12/msg00009.html (mailing-list)
- seclists.org/bugtraq/2019/Dec/31 (mailing-list)
- seclists.org/bugtraq/2019/Dec/32 (mailing-list)
- www.debian.org/security/2019/dsa-4587 (vendor-advisory)
Frequently asked questions
- What is CVE-2019-16254?
- CVE-2019-16254 is a medium-severity vulnerability in Ruby-Lang Ruby, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.3/10. Published 2019-11-26.
- How severe is CVE-2019-16254?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-16254 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.