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Unscored Public exploit CVE-2008-3656 EUVD-2008-3642GHSA-823x-6r7f-v9x6

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick …

Published Aug 13, 2008 · Updated Aug 7, 2024 · Assigned by mitre

Description

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular expression.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 4.0 ruby1.8 1.8.5-4etch3 DSA-1651-1
Debian 4.0 ruby1.9 1.9.0+20060609-1etch3 DSA-1652-1

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
RHEL 5 ruby +8 1.8.5-5.el5_2.5 RHSA-2008:0897
RHEL 4 irb +6 1.8.1-7.el4_7.1 RHSA-2008:0897
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Red Hat Hardened Images 1 ruby3.3 +5 3.3.10-23.1.hum1 RHSA-2026:7305
Red Hat Hardened Images 1 ruby3.4 +5 3.4.8-31.1.hum1 RHSA-2026:7307
Red Hat Hardened Images 1 ruby4.0 +5 4.0.0-33.3.hum1 RHSA-2026:8838

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Metasploit 1 module

Exploit-DB 1

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 6

References