Vulnerability Description
A 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nokogiri | Nokogiri | <= 1.10.3 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- https://github.com/sparklemotion/nokogiri/issues/1915PatchThird Party Advisory
- https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRelease Notes
- https://hackerone.com/reports/650835Permissions Required
- https://lists.debian.org/debian-lts-announce/2019/09/msg00027.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00019.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202006-05Third Party Advisory
- https://usn.ubuntu.com/4175-1/Third Party Advisory
- https://github.com/sparklemotion/nokogiri/issues/1915PatchThird Party Advisory
- https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRelease Notes
- https://hackerone.com/reports/650835Permissions Required
- https://lists.debian.org/debian-lts-announce/2019/09/msg00027.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00019.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202006-05Third Party Advisory
FAQ
What is CVE-2019-5477?
CVE-2019-5477 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A 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 meth...
How severe is CVE-2019-5477?
CVE-2019-5477 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2019-5477?
Check the references section above for vendor advisories and patch information. Affected products include: Nokogiri Nokogiri, Canonical Ubuntu Linux, Debian Debian Linux.