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Red Hat Bugzilla – Attachment 172372 Details for
Bug 254040
CVE-2007-4135 nfs-utils-lib NFSv4 user id mapping flaw
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[patch]
Proposed patch
libnfsidmap-0.12-getpwnam_r-returnfix.patch (text/plain), 731 bytes, created by
Josh Bressers
on 2007-08-23 19:34:20 UTC
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Description:
Proposed patch
Filename:
MIME Type:
Creator:
Josh Bressers
Created:
2007-08-23 19:34:20 UTC
Size:
731 bytes
patch
obsolete
>Hi, > >We received a bugreport for nfsidmap < 0.17. > >nfsidmap maps NFSv4 UID and GIDs between server and client machine. > > >Due to some lack in error checking it can happen that a user unknown >on the client machine is mapped to "root" instead of "nobody". > >Server: Client: >touch /mnt/foo >chown useronlyonserver:users /mnt/foo > ls -l /mnt/foo > -rw-r--r-- 1 root users ... >but it should be: > -rw-r--r-- 1 nobody users ... > >I am not sure if this can be done the other way round (create files >that appear as root on the server), I did not succeed in doing so. > >I am also not sure if this is a security issue at all. >Perhaps Olaf or someone can give some comments here. > >The issue was fixed in nfsidmap 0.17. > >Ciao, Marcus
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bug 254040
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