CVE-2009-4492

Webrick vulnerability

CVSS

7.5

EPSS

15.7%

EPSS pct

97th

Exploited

No known

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.

Affected vendor

Ruby Lang

Affected product

Webrick

CVSS vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Published

2010-01-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 15.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2009-4492

Confirm whether Ruby Lang Webrick is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2009-4492.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-4492

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-4492 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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