CVE-2018-8778

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 controlling the unpacking format (similar to format string vulnerabilities) can trigger a buffer under-read in the String#unpack method, resulting in a massive and controlled information disclosure.

Do I need to act?

0.54% chance of exploitation

EPSS score — low 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

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (13)

Ruby

Ubuntu Linux

Debian Linux

Enterprise Linux

Affected Vendors

Debian Redhat Canonical Ruby-Lang

References (34)

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html

Third Party Advisory http://www.securityfocus.com/bid/103693

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

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/buffer-under-read-unpack-cve-2018-8...

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/

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html

Third Party Advisory http://www.securityfocus.com/bid/103693

Third Party Advisory http://www.securitytracker.com/id/1042004

and 14 more references

/ 100

moderate-risk

Severity 26/34 · High

Exploitability 2/34 · Minimal

Exposure 17/34 · Moderate