[Simon Walter] Bug#506353: mailscanner: many scripts allow local users to overwrite arbitrary files, and more, via symlink attacks

[Julian Field]

I have just released 4.74.7 which fixes this problem and upgrades "tnef" 
to 1.4.5.

On 12/12/08 09:13, Julian Field wrote:
>
>
> On 11/12/08 21:05, Mark Sapiro wrote:
>> Julian Field wrote:
>>> On 11/12/08 16:43, Kai Schaetzl wrote:
>>>> Julian Field wrote on Thu, 11 Dec 2008 14:16:06 +0000:
>>>>
>>>>
>>>>> Please let me know what you think works and what still doesn't 
>>>>> work, if
>>>>> anything.
>>>>>
>>>> So far so good. Got this on first restart:
>>>>
>>>> Dec 11 17:31:10 d01 MailScanner[11441]: Could not test file ownership
>>>> abilities on
>>>> /var/spool/MailScanner/incoming/Locks/MailScanner.ownertest.11441, 
>>>> please
>>>> delete the file
>>>>
>>>> file doesn't exist, though. Directory contains lockfiles for all the
>>>> virusscan wrappers, no matter if in use or not. Is this intended?
>>>>
>>>> Everything seems to be fine.
>>>> How to test? Run /etc/cron.hourly/update_virus_scanners ?
>>>>
>>> Do
>>> MailScanner --lint
>>> and
>>> /usr/sbin/update_virus_scanners
>>>
>>> If it complains about there not being a MailScannerCreateLocks or
>>> anything in /usr/lib/MailScanner/mailscanner_create_locks or the
>>> /usr/sbin/mailscanner_create_locks script not existing, please do
>>> ls -ld /usr/sbin/mail* /usr/sbin/Mail*
>>
>>
>> MailScanner --lint looks good.
>>
>> /usr/sbin/update_virus_scanners produces no error.
>>
>> Everything seems to be working normally, but each time a child starts,
>> a message like the following is logged:
>>
>> Dec 11 11:24:07 sbh16 MailScanner[23654]: Could not test file ownership
>> abilities on
>> /var/spool/MailScanner/incoming/Locks/MailScanner.ownertest.23654,
>> please delete the file
> Please try the attached /usr/lib/MailScanner/MailScanner/WorkArea.pm 
> file and restart MailScanner. That should have fixed that problem.
>
> Jules
>

Jules

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PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654


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