Bug 454646 - lgroupmod can corrupt the format of /etc/group
lgroupmod can corrupt the format of /etc/group
Status: ASSIGNED
Product: Fedora
Classification: Fedora
Component: libuser (Show other bugs)
26
All Linux
medium Severity medium
: ---
: ---
Assigned To: Jakub Hrozek
Fedora Extras Quality Assurance
https://fedorahosted.org/libuser/tick...
: Reopened, Triaged
Depends On:
Blocks: 646380
  Show dependency treegraph
 
Reported: 2008-07-09 11:07 EDT by Milos Malik
Modified: 2018-01-11 10:00 EST (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 646380 (view as bug list)
Environment:
Last Closed: 2016-07-19 16:25:42 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Milos Malik 2008-07-09 11:07:52 EDT
From Bugzilla Helper:
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Description of problem:
lgroupmod has the same problem which is described in bz#454443. Some strings are not checked for ':'.

Version-Release number of selected component (if applicable):
libuser-0.56.6-2

How reproducible:
Always


Steps to Reproduce:
# lgroupadd poorgroup
# grep poor /etc/group
poorgroup:x:502:
# grep poor /etc/gshadow
poorgroup:!!::
# lgroupmod -n "poor:group" poorgroup
Group poorgroup could not be modified: data not found in file
# grep poor /etc/group
poor:x:x:502:
# grep poor /etc/gshadow
poor:!!:!!::
# lgroupdel poorgroup
Group poorgroup does not exist.
# lgroupdel "poor:group"
Group poor:group does not exist.
# lgroupdel "poor"

** (process:14622): WARNING **: invalid ID
Group poor could not be deleted: group poor has no GID


Actual Results:
lgroupmod accepts a group name containing ':'.

Expected Results:
lgroupmod refuses a group name containing ':'.

Additional info:
Comment 1 Milos Malik 2008-07-10 08:53:00 EDT
Following parameters of lgroupmod are vulnerable to "<some>:<thing>" attack:
-A
-M
-n
-p

RHTS test for this bug is available (
/CoreOS/libuser/Regression/bz454646-lgroupmod-corrupt-etc-group ).
Comment 2 Miloslav Trmač 2008-07-23 09:37:49 EDT
Thanks for your report.

Parts should be fixed in current development version, the rest is
https://fedorahosted.org/libuser/ticket/2 .
Comment 3 Bug Zapper 2008-11-26 05:58:58 EST
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Comment 4 Bug Zapper 2009-11-18 03:13:38 EST
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Comment 5 Bug Zapper 2010-11-04 07:51:20 EDT
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Although we aim to fix as many bugs as possible during every release's 
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