CVE-2008-3656 EXPLOIT
7.8
HIGH · CVSS 2.0 · EPSS 70.2% (pctl 99)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.8 (HIGH, v2.0) |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
| EPSS | 70.2% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-399 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2008-08-13 |
| Last modified | 2026-06-16 |
Affected (1)
| Vendor | Product |
|---|---|
| ruby-lang | ruby |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Ruby 1.9 - 'WEBrick::HTTP::DefaultFileHandler' Crafted HTTP Request Denial of Service | 2008-08-11 |
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
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