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    CVE-2008-3656

    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.

    Published:Aug 8, 2008
    Last Modified:Apr 23, 2026
    EPS:Aug 13, 2008
    EPSS Score:0.65085
    CVSS Score:7.8

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Ruby-lang
    Product
    Ruby

    Exploits

    http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/https://www.exploit-db.com/exploits/32222

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494401
    http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
    http://secunia.com/advisories/31430
    http://secunia.com/advisories/31697
    http://secunia.com/advisories/32165
    http://secunia.com/advisories/32219
    http://secunia.com/advisories/32255
    http://secunia.com/advisories/32256
    http://secunia.com/advisories/32371
    http://secunia.com/advisories/33178
    http://secunia.com/advisories/35074
    http://security.gentoo.org/glsa/glsa-200812-17.xml
    http://support.apple.com/kb/HT3549
    http://support.avaya.com/elmodocs2/security/ASA-2008-424.htm
    http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0264
    http://www.debian.org/security/2008/dsa-1651
    http://www.debian.org/security/2008/dsa-1652
    http://www.redhat.com/support/errata/RHSA-2008-0897.html
    http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/
    http://www.securityfocus.com/archive/1/495884/100/0/threaded
    http://www.securityfocus.com/bid/30644
    http://www.securitytracker.com/id?1020654
    http://www.us-cert.gov/cas/techalerts/TA09-133A.html
    http://www.vupen.com/english/advisories/2008/2334
    http://www.vupen.com/english/advisories/2009/1297
    https://exchange.xforce.ibmcloud.com/vulnerabilities/44371
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9682
    https://usn.ubuntu.com/651-1/
    https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00259.html
    https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00299.html
    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494401
    http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
    http://secunia.com/advisories/31430
    http://secunia.com/advisories/31697
    http://secunia.com/advisories/32165
    http://secunia.com/advisories/32219
    http://secunia.com/advisories/32255
    http://secunia.com/advisories/32256
    http://secunia.com/advisories/32371
    http://secunia.com/advisories/33178
    http://secunia.com/advisories/35074
    http://security.gentoo.org/glsa/glsa-200812-17.xml
    http://support.apple.com/kb/HT3549
    http://support.avaya.com/elmodocs2/security/ASA-2008-424.htm
    http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0264
    http://www.debian.org/security/2008/dsa-1651
    http://www.debian.org/security/2008/dsa-1652
    http://www.redhat.com/support/errata/RHSA-2008-0897.html
    http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/
    http://www.securityfocus.com/archive/1/495884/100/0/threaded
    http://www.securityfocus.com/bid/30644
    http://www.securitytracker.com/id?1020654
    http://www.us-cert.gov/cas/techalerts/TA09-133A.html
    http://www.vupen.com/english/advisories/2008/2334
    http://www.vupen.com/english/advisories/2009/1297
    https://exchange.xforce.ibmcloud.com/vulnerabilities/44371
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9682
    https://usn.ubuntu.com/651-1/
    https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00259.html
    https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00299.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High