Bug 4725

Summary: wget should not chmod mirrored symlinks to 0777
Product: [Retired] Red Hat Linux Reporter: charles
Component: wgetAssignee: David Lawrence <dkl>
Status: CLOSED NEXTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 6.0Keywords: Security
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OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 1999-08-26 20:32:22 UTC Type: ---
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Description charles 1999-08-26 18:25:06 UTC
Assume the maintainer of an anonymous ftp site is malicious
toward someone who uses wget to mirror his site.  He could
put in simlinks such as

	a -> ..
	b -> ../..
	c -> ../../..
	d -> ../../../..
	s -> /bin/sh
	etc.

Those will all be listed as having 0777 perms since all
simlinks do.  If wget --mirror, for example, is used to
mirror this ftp site and the wget user is not aware of
the presence of those links (among a bunch of others files),
wget will do ``chmod 0777 l'' on the copy of link l thereby
effectively changing the permission of the pointed-to file,
if the wget user has the right to do so.  This could then be
used by a local user of the system running wget.

I will send a patch for this which I submitted to
bug-wget@gnu.org without receving an answer for 2 months.

Comment 1 Jeff Johnson 1999-08-26 20:32:59 UTC
Fixed in wget-1.5.3-5. Thanks for the patch.