From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.15) Gecko/20080702 Fedora/2.0.0.15-1.fc8 Firefox/2.0.0.15 Description of problem: The lusermod utility does not check if given comment contains ':' character. Because this character is used as delimiter in /etc/passwd, any comment with this character can cause format corruption in /etc/passwd. The useradd and usermod utilities from shadow-utils package do check the comment. # useradd -c "chu:dak" chudak useradd: invalid comment 'chu:dak' # useradd chudak # usermod -c "chu:dak" chudak usermod: invalid field 'chu:dak' # grep chudak /etc/passwd chudak:x:503:503::/home/chudak:/bin/bash Version-Release number of selected component (if applicable): libuser-0.56.6-2 How reproducible: Always Steps to Reproduce: 1. luseradd pooruser 2. grep pooruser /etc/passwd pooruser:x:502:502:pooruser:/home/pooruser:/bin/bash 3. lusermod -c "poor:user" pooruser 4. grep pooruser /etc/passwd pooruser:x:502:502:poor:/home/pooruser:/bin/bash:/bin/bash 5. lusermod -c "pooruser" pooruser 6. grep pooruser /etc/passwd pooruser:x:502:502:pooruser:/home/pooruser:/bin/bash:/bin/bash:/bin/bash 7. ... Actual Results: The line in /etc/passwd which contains info about the just created user has invalid format. Expected Results: The line in /etc/passwd which contains info about the just created user has valid format. Additional info:
Thanks, good catch.
luseradd has similar flaw: # grep pooruser /etc/passwd # luseradd -c "poor:user" pooruser Error creating user: couldn't determine security context for `user': No such file or directory. # grep pooruser /etc/passwd pooruser:x:501:501:poor:user:/home/pooruser:/bin/bash #
Following parameters of luseradd are vulnerable to "<some>:<thing>" attack: -c -d -s Following parameters of lusermod are vulnerable to "<some>:<thing>" attack: -c -d -s -l RHTS test for this bug is available ( /CoreOS/libuser/Regression/bz454443-luseradd-lusermod-corrupt-etc-passwd ).
Parameter -p which supported by luseradd and lusermod is also vulnerable to "<some>:<thing>" attack.
The current development version won't corrupt the file format, but does not handle recovery well - see https://fedorahosted.org/libuser/ticket/2 .
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