Bug 51495

Summary: mod_substitute cpu and memory limit
Product: Apache httpd-2 Reporter: Maksymilian <max>
Component: mod_substituteAssignee: Apache HTTPD Bugs Mailing List <bugs>
Status: RESOLVED LATER    
Severity: normal Keywords: MassUpdate
Priority: P2    
Version: 2.2.19   
Target Milestone: ---   
Hardware: PC   
OS: NetBSD   

Description Maksymilian 2011-07-11 00:40:17 UTC
In my opinion CPU and memory limit for mod_substitute is missing here.
The first problem in this module, is not limiting execution time and
memory. It allow to local denial of service. We don't need convince that
the use of PCRE is dangerous. So we need limit output time and memory in
mod_substitute.

-memory-exhaustion-
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|(.*(!?))||if"
-memory-exhaustion-
Result:
Jul  5 13:16:04 127 /netbsd: UVM: pid 1768 (httpd), uid 1006 killed: out
of swap


-crash-
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|((.*){2222,}(.*){2222,})||iq"
-crash-
Result:
[Mon Jul 11 02:57:29 2011] [notice] child pid 28 exit signal Illegal
instruction (4)


-cpu-exhaustion-
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|(.*+(.*){2222,}(.*)+(.*){22,})||iq"
-cpu-exhaustion-
Result:
Long executing time, providing to memory exhaustion
Comment 1 William A. Rowe Jr. 2018-11-07 21:08:44 UTC
Please help us to refine our list of open and current defects; this is a mass update of old and inactive Bugzilla reports which reflect user error, already resolved defects, and still-existing defects in httpd.

As repeatedly announced, the Apache HTTP Server Project has discontinued all development and patch review of the 2.2.x series of releases. The final release 2.2.34 was published in July 2017, and no further evaluation of bug reports or security risks will be considered or published for 2.2.x releases. All reports older than 2.4.x have been updated to status RESOLVED/LATER; no further action is expected unless the report still applies to a current version of httpd.

If your report represented a question or confusion about how to use an httpd feature, an unexpected server behavior, problems building or installing httpd, or working with an external component (a third party module, browser etc.) we ask you to start by bringing your question to the User Support and Discussion mailing list, see [https://httpd.apache.org/lists.html#http-users] for details. Include a link to this Bugzilla report for completeness with your question.

If your report was clearly a defect in httpd or a feature request, we ask that you retest using a modern httpd release (2.4.33 or later) released in the past year. If it can be reproduced, please reopen this bug and change the Version field above to the httpd version you have reconfirmed with.

Your help in identifying defects or enhancements still applicable to the current httpd server software release is greatly appreciated.