CVE-2018-8779

NameCVE-2018-8779
DescriptionIn 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 UNIXServer.open and UNIXSocket.open methods are not checked for null characters. It may be connected to an unintended socket.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1358-1, DLA-1359-1, DLA-1421-1, DSA-4259-1
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ruby2.1 (PTS)jessie2.1.5-2+deb8u3vulnerable
jessie (security)2.1.5-2+deb8u6fixed
ruby2.3 (PTS)stretch2.3.3-1+deb9u2vulnerable
stretch (security)2.3.3-1+deb9u4fixed
ruby2.5 (PTS)buster, sid2.5.3-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ruby1.8source(unstable)(unfixed)medium
ruby1.8sourcewheezy1.8.7.358-7.1+deb7u6mediumDLA-1359-1
ruby1.9.1source(unstable)(unfixed)medium
ruby1.9.1sourcewheezy1.9.3.194-8.1+deb7u8mediumDLA-1358-1
ruby2.1source(unstable)(unfixed)medium
ruby2.1sourcejessie2.1.5-2+deb8u4mediumDLA-1421-1
ruby2.3source(unstable)(unfixed)medium
ruby2.3sourcestretch2.3.3-1+deb9u3mediumDSA-4259-1
ruby2.5source(unstable)2.5.1-1medium

Notes

https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-unixsocket-cve-2018-8779/
https://hackerone.com/reports/302997
Fixed by: https://github.com/ruby/ruby/commit/8794dec6a5f11adc5cdd19a5ee91ea6b0816763f
Fixed by: https://github.com/ruby/ruby/commit/47165eed264d357e78e27371cfef20d5c2bde5d9 (2.2.10)
ruby1.8: test examples from hackerone doesn't work. ext/socket/socket.c:init_unixsock() uses SafeStringValue(path) though.

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