DescriptionDirectory traversal vulnerability in actionpack/lib/action_dispatch/middleware/static.rb in Action Pack in Ruby on Rails 3.x before 3.2.21, 4.0.x before 4.0.12, 4.1.x before 4.1.8, and 4.2.x before 4.2.0.beta4, when serve_static_assets is enabled, allows remote attackers to determine the existence of files outside the application root via vectors involving a \ (backslash) character, a similar issue to CVE-2014-7818.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs770934

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
rails (PTS)buster2:
buster (security)2:
bullseye (security), bullseye2:
sid, trixie2:

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
railssourcesqueeze(not affected)
railssourcewheezy(not affected)
ruby-actionpack-2.3source(unstable)(not affected)


[wheezy] - rails <not-affected> (src:rails in wheezy is just a transition package)
[squeeze] - rails <not-affected> (Only affects >= 3)
[wheezy] - ruby-actionpack-3.2 <no-dsa> (Minor issue)
- ruby-actionpack-2.3 <not-affected> (Only affects >= 3)

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