Bug 244860 - tcpdump -Z -C should drop root privileges completely
tcpdump -Z -C should drop root privileges completely
Product: Fedora
Classification: Fedora
Component: tcpdump (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Miroslav Lichvar
Depends On:
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Reported: 2007-06-19 10:54 EDT by Miroslav Lichvar
Modified: 2007-11-30 17:12 EST (History)
0 users

See Also:
Fixed In Version: 3.9.7-1.fc7
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2007-07-31 18:55:28 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Miroslav Lichvar 2007-06-19 10:54:38 EDT
Description of problem:
tcpdump sets only effective uid and gid when -Z option is used (enabled by
default) with -C option. It is a result of the patch for bug #176010.

Setting only euid removes an extra security layer that might otherwise have
mitigated an eventual security problem.

A better solution for the bug is to call setuid() before the first file is
opened, then all files will have pcap owner and tcpdump can drop root privileges

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

Steps to Reproduce:
1. tcpdump -C 1 -w dump
2. cat /proc/{tcpdump}/status | grep Uid
Actual results:
Uid:	0	77	0	77

Expected results:
Uid:	77	77	77	77
Comment 1 Miroslav Lichvar 2007-07-25 04:48:45 EDT
Fixed in tcpdump-3.9.7-1.fc8.
Comment 2 Fedora Update System 2007-07-31 18:55:26 EDT
tcpdump-3.9.7-1.fc7 has been pushed to the Fedora 7 stable repository.  If problems still persist, please make note of it in this bug report.

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