RubySec

Providing security resources for the Ruby community

CVE-2009-4492 (webrick): WEBrick Improper Input Validation vulnerability

ADVISORIES

GEM

webrick

SEVERITY

CVSS v2.0: 7.5 (High)

PATCHED VERSIONS

  • >= 1.4.0

DESCRIPTION

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

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