CVE-2019-5477

NameCVE-2019-5477
DescriptionA command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. Processes are vulnerable only if the undocumented method `Nokogiri::CSS::Tokenizer#load_file` is being called with unsafe user input as the filename. This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.
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-1933-1
NVD severityhigh
Debian Bugs934802, 940905

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
rexical (PTS)sid, buster, stretch1.0.5-2vulnerable
ruby-nokogiri (PTS)jessie1.6.3.1+ds-1vulnerable
jessie (security)1.6.3.1+ds-1+deb8u1fixed
stretch1.6.8.1-1vulnerable
buster1.10.0+dfsg1-2vulnerable
bullseye, sid1.10.4+dfsg1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
rexicalsource(unstable)(unfixed)940905
ruby-nokogirisource(unstable)1.10.4+dfsg1-1934802
ruby-nokogirisourcejessie1.6.3.1+ds-1+deb8u1DLA-1933-1

Notes

[buster] - rexical <no-dsa> (Minor issue, can be fixed via point release)
[stretch] - rexical <no-dsa> (Minor issue, can be fixed via point release)
[buster] - ruby-nokogiri <no-dsa> (Minor issue, can be fixed via point release)
[stretch] - ruby-nokogiri <no-dsa> (Minor issue, can be fixed via point release)
https://github.com/sparklemotion/nokogiri/issues/1915
Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file
is being passed untrusted user input.
https://github.com/tenderlove/rexical/commit/a652474dbc66be350055db3e8f9b3a7b3fd75926
Change in rexical is covered by the scope of this CVE.

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