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Shadow "useradd.c" Insecure Mailbox File Permissions
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Secunia Advisory:
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SA20370
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Release Date:
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2006-05-31
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Last Update:
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2007-12-17
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Popularity:
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7,643 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | Shadow 4.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2006-1174
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Description:
A security issue has been reported in Shadow, which potentially can be exploited by malicious, local users to perform certain actions with escalated privileges.
The security issue is cause due to the "mode" flag not being supplied to the "open()" function in useradd.c when creating a user's mailbox file. This causes the mailbox to be created with unpredictable file permissions and may allow malicious users to read or modify the mailbox.
The security issue has been reported in version 4.0.7 and prior.
Solution:
Update to version 4.0.8 or later.
ftp://ftp.pld.org.pl/software/shadow/
Provided and/or discovered by:
Reported by vendor.
Changelog:
2007-12-17: Added link to US-CERT.
Original Advisory:
http://cvs.pld.org.pl/shadow/NEWS?rev=1.109
http://cvs.pld.org.pl/shadow/src/useradd.c?r1=1.50&r2=1.51
Other References:
US-CERT VU#312692:
http://www.kb.cert.org/vuls/id/312692
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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