CVE-2018-8780

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, the Dir.open, Dir.new, Dir.entries and Dir.empty? methods do not check NULL characters. When using the corresponding method, unintentional directory traversal may be performed.

Do I need to act?

~
1.3% 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
9
CVSS 9.1/10 Critical
NETWORK / LOW complexity

Affected Products (8)

Affected Vendors

Debian Canonical Ruby-Lang

References (40)

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
Third Party Advisory http://www.securityfocus.com/bid/103739
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
Mailing List 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/3626-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4259
Vendor Advisory https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780...
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
49
/ 100
moderate-risk
Severity 31/34 · Critical
Exploitability 4/34 · Minimal
Exposure 14/34 · Moderate