Bug 155745 - CAN-2005-0988 Race condition in gzip
CAN-2005-0988 Race condition in gzip
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: gzip (Show other bugs)
All Linux
medium Severity low
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Assigned To: Ivana Varekova
Ben Levenson
: Security
Depends On:
  Show dependency treegraph
Reported: 2005-04-22 14:18 EDT by Josh Bressers
Modified: 2007-11-30 17:07 EST (History)
0 users

See Also:
Fixed In Version: RHSA-2005-357
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2005-06-13 08:12:57 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Proposed patch from Steve Grubb (1.29 KB, patch)
2005-04-29 09:59 EDT, Josh Bressers
no flags Details | Diff

  None (edit)
Description Josh Bressers 2005-04-22 14:18:09 EDT
Race condition in gzip 1.2.4, 1.3.3, and earlier when decompressing a gzip
allows local users to modify permissions of arbitrary files via a hard link
attack on a file while it is being decompressed, whose permissions are changed
by gzip after the decompression is complete.

Comment 1 Josh Bressers 2005-04-22 14:21:03 EDT
This issue should also affect RHEL2.1 and RHEL3.
Comment 2 Josh Bressers 2005-04-29 09:59:33 EDT
Created attachment 113841 [details]
Proposed patch from Steve Grubb
Comment 3 Ivana Varekova 2005-05-03 05:46:47 EDT
The new versions (gzip-1.3.3-11.rhel3, gzip-1.3.3-15.rhel4, gzip-1.3-17.rhel2)
Ivana Varekova
Comment 4 Petter Reinholdtsen 2005-05-20 12:18:37 EDT
This bug has been reported into Debian BTS too.  There, a different
patch is suggested to solve the problem.  The debian patch is a lot
shorter.  Have a look at <URL: http://bugs.debian.org/305255 >.
(Just mentioning it, to give you information about another approach.)
Comment 5 Petter Reinholdtsen 2005-05-20 12:58:33 EDT
I was just confused.  The debian bug I posted is for CAN-2005-1228, and not
this bug.  The currect debian bug for CAN-2005-0988 is #303927.
Comment 6 Josh Bressers 2005-06-13 08:12:58 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

Comment 7 Derek T. Yarnell 2005-11-30 13:09:59 EST
This has to be re-opened.  This patch has produced a bug in gzip files over NFS.  The problem crops up 
with the fchmod hanging for a long time and pushing rpciod load through the roof.  Sometimes the gzip 
finishes and sometimes it doesn't.  I can produce the file that hangs the machine (1.2gig file, 
decompresses into 3gig file) please contact derek@umiacs.umd.edu.

I have tested this with the Suse unpatched version of this and since it closes the file first then runs chmod 
it does not hang indefinitely.

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