Bug 241677

Summary:	tcpdump -Z -C should drop root privileges completely
Product:	Red Hat Enterprise Linux 5	Reporter:	Miroslav Lichvar <mlichvar>
Component:	tcpdump	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHSA-2007-0368	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-07 15:33:34 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Miroslav Lichvar 2007-05-29 14:54:23 UTC

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
completely.

Version-Release number of selected component (if applicable):
tcpdump-3.9.4-8.1

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 RHEL Program Management 2007-05-29 15:04:20 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 6 errata-xmlrpc 2007-11-07 15:33:34 UTC

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.

http://rhn.redhat.com/errata/RHSA-2007-0368.html