CVE-2018-8778 — Use of Externally-Controlled Format String in Ruby

CWE-134 — Use of Externally-Controlled Format StringCWE-22 — Path Traversal11 documents8 sources
Severity
7.5HIGHNVD
EPSS
0.5%
top 32.46%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Ruby-lang RubyCanonical Ubuntu LinuxDebian Linux+1 more
Timeline
PublishedApr 3
Latest updateMay 13

Description

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.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

▶NVDruby-lang/ruby2.2.0 — 2.2.10+4
▶Alpineruby-lang/ruby< 2.5.1-r0+19

Also affects: Debian Linux 7.0, 8.0, 9.0, Ubuntu Linux 14.04, 16.04, 17.10, Enterprise Linux 6.0, 7.0, 7.4, 7.5, 7.6

Patches

Patch: www.ruby-lang.org ↗Patch: www.ruby-lang.org ↗Patch: www.ruby-lang.org ↗

🔴Vulnerability Details

4
GHSA
GHSA-wvhq-ch4h-8pwr: In Ruby before 2↗2022-05-13
▶
OSV
ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities↗2018-04-16
▶
OSV
CVE-2018-8778: In Ruby before 2↗2018-04-03
▶
CVEList
CVE-2018-8778: In Ruby before 2↗2018-04-03
▶

📋Vendor Advisories

4
Apple
CVE-2018-8778: macOS Mojave 10.14.1, Security Update 2018-002 High Sierra, Security Update 2018-005 Sierra↗2018-10-30
▶
Apple
CVE-2018-8778: macOS High Sierra 10.13.6, Security Update 2018-004 Sierra, Security Update 2018-004 El Capitan↗2018-07-09
▶
Ubuntu
Ruby vulnerabilities↗2018-04-16
▶
Red Hat
ruby: Buffer under-read in String#unpack↗2018-03-28
▶

💬Community

2
Bugzilla
CVE-2018-8778 ruby: Buffer under-read in String#unpack↗2018-03-29
▶
Bugzilla
CVE-2017-17742 CVE-2018-6914 CVE-2018-8777 CVE-2018-8778 CVE-2018-8779 CVE-2018-8780 ruby: various flaws [fedora-all]↗2018-03-29
▶
CVE-2018-8778 — Ruby-lang Ruby vulnerability | cvebase