CVE-2018-8777

moderate-risk
Published 2018-04-03

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker can pass a large HTTP request with a crafted header to WEBrick server or a crafted body to WEBrick server/handler and cause a denial of service (memory consumption).

Do I need to act?

~
1.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (13)

Affected Vendors

Debian Redhat Canonical Ruby-Lang

References (40)

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
Third Party Advisory http://www.securityfocus.com/bid/103683
Third Party Advisory http://www.securitytracker.com/id/1042004
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3729
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3730
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3731
https://access.redhat.com/errata/RHSA-2019:2028
https://access.redhat.com/errata/RHSA-2020:0542
https://access.redhat.com/errata/RHSA-2020:0591
https://access.redhat.com/errata/RHSA-2020:0663
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
Mailing List https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html
Mailing List https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
Third Party Advisory https://usn.ubuntu.com/3685-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4259
Vendor Advisory https://www.ruby-lang.org/en/news/2018/03/28/large-request-dos-in-webrick-cve-20...
Patch https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/
Patch https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/
Patch https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/
Patch https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/
and 20 more references
47
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 4/34 · Minimal
Exposure 17/34 · Moderate