Re: Any status on timestamp vulnerability fix for 4.X?

Richard Coleman wrote:
> Uwe Doering wrote:
> 
>> Richard Coleman wrote:
>>
>>> Any information on when (or if) the following timestamp vulnerability 
>>> will be fixed for 4.X?  Any information would be appreciated.
>>>
>>> http://www.kb.cert.org/vuls/id/637934
>>
>> FYI, the fix for RELENG_5 applies to RELENG_4 as is (apart from the 
>> CVS version header, of course):
>>
>> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_input.c.diff?r1=1.252.2.15&r2=1.252.2.16&f=u 
>>
>> After verifying its semantic correctness for RELENG_4 we've been 
>> running the patch for a couple of weeks now with no ill effects.
>>
>> I'm posting this also as an encouragement for committers to go ahead 
>> and do the MFC.  It's low hanging fruit.
>>
>>    Uwe
> 
> We tried applying that diff to 4.10, but compilation failed with
> 
> tcp_input.o: In function 'tcp_dooptions':
> tcp_input.o(.text+0x21d8): undefined reference to 'TSTMP_GT'
> 
> Did you just define that macro?  Or was something else required?

Well, this MFC affected two files, actually.  I didn't mention it 
explicitly because I considered it obvious from the accompanying CVS 
comment:

---------------- cut here ----------------
MFC: rev 1.270 of tcp_input.c, rev 1.25 of tcp_seq.h
- Tighten up the Timestamp checks to prevent a spoofed segment from
   setting ts_recent to an arbitrary value, stopping further
   communication between the two hosts.
- If the Echoed Timestamp is greater than the current time,
   fall back to the non RFC 1323 RTT calculation.
---------------- cut here ----------------

So 'tcp_seq.h' needs to be patched, too.  Here's the direct link to that 
diff:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_seq.h.diff?r1=1.22.2.1&r2=1.22.2.2&f=u

With both patches in place the kernel ought to compile correctly.  Hope 
it works for you now.

    Uwe
-- 
Uwe Doering         |  EscapeBox - Managed On-Demand UNIX Servers
gemini@geminix.org  |  http://www.escapebox.net
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