milter policy hardening

[Daniel J Walsh]

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On 04/09/2010 08:14 AM, Paul Howarth wrote:
> Here I have a couple of changes to the milter policy that reduce what
> milters (well, spamass-milter in particular) are able to do.
> 
> Firstly, I noticed a while back that I was getting AVCs from
> milter-regex and milter-greylist trying to read /proc/cpuinfo at program
> start-up. I couldn't figure out what was causing that to happen
> (probably part of some system call or maybe in libmilter) but this
> access being denied didn't seem to cause any problems. I also saw that
> the spamass-milter policy allowed this access. A few weeks ago I updated
> my local policy to dontaudit this instead of allowing it and don't
> appear to be suffering any problems as a result, so I propose to
> dontaudit it in the milter template.
> 
> Secondly, the fix for CVE-2010-1132 in spamass-milter was just pushed to
> stable for all supported Fedora and EPEL releases. This was unsanitized
> input being passed in an argument to popen() and hence a shell. Upstream
> proposed a patch for this several weeks ago that replaced the popen()
> call with execve() via a wrapper called popenv(), which avoids the use
> of a shell for this functionality. This fix hasn't been committed to
> upstream CVS yet but I have tested it extensively myself and this fix
> has been incorporated into the Fedora and Debian spamass-milter
> packages. So for Fedora and Debian, the following policy rules are no
> longer needed:
> 
> corecmd_exec_shell(spamass_milter_t)
> corecmd_search_bin(spamass_milter_t)
> 
> These changes are all included in the attached patch against Rawhide
> policy.
> 
> Paul.
> 
> 
> 
> --
> selinux mailing list
> selinux at lists.fedoraproject.org
> https://admin.fedoraproject.org/mailman/listinfo/selinux
Applied to selinux-policy-3.7.18-2.fc13.noarch
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