CVE-2008-1891

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2008-04-18 · updated 2026-06-16
Weakness: CWE-22

Description

Directory traversal vulnerability in WEBrick in Ruby 1.8.4 and earlier, 1.8.5 before 1.8.5-p231, 1.8.6 before 1.8.6-p230, 1.8.7 before 1.8.7-p22, and 1.9.0 before 1.9.0-2, when using NTFS or FAT filesystems, allows remote attackers to read arbitrary CGI files via a trailing (1) + (plus), (2) %2b (encoded plus), (3) . (dot), (4) %2e (encoded dot), or (5) %20 (encoded space) character in the URI, possibly related to the WEBrick::HTTPServlet::FileHandler and WEBrick::HTTPServer.new functionality and the :DocumentRoot option.

Affected products

Ruby: through 1.9.0; 1.8.5, 1.8.6

References

http://aluigi.altervista.org/adv/webrickcgi-adv.txt
http://lists.opensuse.org/opensuse-security-announce/2008-08/msg00006.html
http://secunia.com/advisories/29794
http://secunia.com/advisories/30831
http://secunia.com/advisories/31687
http://www.mandriva.com/security/advisories?name=MDVSA-2008:140
http://www.mandriva.com/security/advisories?name=MDVSA-2008:141
http://www.ruby-lang.org/en/news/2008/06/20/arbitrary-code-execution-vulnerabilities/
http://www.vupen.com/english/advisories/2008/1245/references
https://exchange.xforce.ibmcloud.com/vulnerabilities/41824
https://www.redhat.com/archives/fedora-package-announce/2008-June/msg00937.html
http://aluigi.altervista.org/adv/webrickcgi-adv.txt

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