general/4728: .htpasswd file can be wiped out if filesystem full

[Scott Murdock <sc...@blairlake.com>]

>Number:         4728
>Category:       general
>Synopsis:       .htpasswd file can be wiped out if filesystem full
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Jul 14 08:40:01 PDT 1999
>Last-Modified:
>Originator:     scott@blairlake.com
>Organization:
apache
>Release:        
>Environment:
Linux 2.1.24 #129 Thu Jul 9 13:35:11 EST 1998 ppc unknown
>Description:
If the .htpasswd file is on a filesystem that has become full, then if the "htpasswd" binary is executed to add a new web user the existing data in ,htpasswd will be wiped out before the binary realizes the filesystem is full and aborts with an error.
>How-To-Repeat:
Fill the filesystem that ".htpasswd" sits on, then try to add a new username via the "htpassed" binary.
>Fix:
Have the binary somehow test to see if it can completely write the new ".htpasswd" file before it actually opens ".htpasswd" for writing.
>Audit-Trail:
>Unformatted:
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