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From Moonhyoung Lee <p...@korea.com>
Subject mod_negotiation/8482: mod_negotiation could corrupt the value of request's mtime.
Date Sun, 07 Oct 2001 08:45:22 GMT

>Number:         8482
>Category:       mod_negotiation
>Synopsis:       mod_negotiation could corrupt the value of request's mtime.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Sun Oct 07 01:50:00 PDT 2001
>Originator:     pooz@korea.com
>Release:        1.3.20
Linux vaio.made21.com 2.4.3-12 #1 Fri Jun 8 15:05:56 EDT 2001 i686 unknown
File: mod_negotiation.c
Func: read_types_multi()
Line: 1010
      set_vlist_validator(r, r);

When handling multiview, If there's no files matching, it could set request's
modified time (r->mtime) to unknown value. To prevent this, there should be 
a check for validity of r->finfo (or number of matches) before calling

Since r->mtime is checked against If-Modified-Since value, so if there's any
other module generating something without Last-Modified header, the check could
possibly fail.


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