DescriptionRubyGems 2.0.x before 2.0.16, 2.2.x before 2.2.4, and 2.4.x before 2.4.7 does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record, aka a "DNS hijack attack."
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)
NVD severitymedium
Debian Bugs790111, 790119

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
jruby (PTS)stretch1.7.26-1+deb9u1fixed
stretch (security)1.7.26-1+deb9u3fixed
sid, buster9.1.17.0-3fixed
rubygems (PTS)bullseye, sid3.2.5-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
jrubysourcesqueeze(not affected)
jrubysourcewheezy(not affected)
jrubysourcejessie(not affected)
libgems-rubysource(unstable)(not affected)
ruby1.8source(unstable)(not affected)
ruby1.9.1source(unstable)(not affected)
rubygemssource(unstable)(not affected)


- rubygems <not-affected> (Affects versions between 2.0 and 2.4.6)
- libgems-ruby <not-affected> (Affects versions between 2.0 and 2.4.6)
- ruby1.8 <not-affected> (Vulnerable code not present)
- ruby1.9.1 <not-affected> (Bundles 1.8.23, vulnerable code introduced in later 1.9.1 versions)
[jessie] - jruby <not-affected> (Vulnerable code introduced with 1.7.19)
[wheezy] - jruby <not-affected> (Vulnerable code introduced with 1.7.19)
[squeeze] - jruby <not-affected> (Vulnerable code introduced with 1.7.19)

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