[clamav-users] Startup crash on MacOS X - version 0.100.0

Al Varnell alvarnell at mac.com
Wed May 9 23:42:54 EDT 2018


Lots of variables here, but there has to be an actual bug somewhere. A corrupt yara file should just cause it to be ignored with a log entry indicating what's wrong and not crash ClamAV. That's what happens with one of the .yara files I've been using where I get:

> LibClamAV Error: yyerror(): /usr/local/clamXav/share/clamav/AlienVault.yara line 55 syntax error, unexpected _TEXT_STRING_, expecting _CONDITION_
> LibClamAV Error: cli_loadyara: failed to parse rules file /usr/local/clamXav/share/clamav/AlienVault.yara, error count 1


Yara appears to still be evolving since it's introduction maybe four years ago? Apple began to include it as a PrivateFramework with the OS at some point and currently uses it as a supplement to it's XProtect process. But I think that the ClamAV capability is completely self-contained.

If all those except for the two Sanesecurity files are old, then it would seem to be a 0.100.0 bug in not being able to parse something.

-Al-

On Wed, May 09, 2018 at 07:10 PM, James Brown wrote:
> Yeah, it was all these:
> 
> packer.yar
> winnow_malware.yara
> CVE-2010-0887.yar
> maldoc_somerules.yar
> CVE-2010-0805.yar
> antidebug_antivm.yar
> CVE-2010-1297.yar
> CVE-2013-0074.yar
> CVE-2013-0422.yar
> CVE-2015-5119.yar
> Maldoc_Hidden_PE_file.yar
> EK_Zeus.yar
> EK_Sakura.yar
> EK_ZeroAcces.yar
> EK_Zerox88.yar
> EK_Fragus.yar
> EK_Phoenix.yar
> EK_BleedingLife.yar
> EK_Crimepack.yar
> EK_Eleonore.yar
> EK_Angler.yar
> EK_Blackhole.yar
> Zeus_EK.yar
> ZeroAcces_EK.yar
> Zerox88_EK.yar
> Phoenix_EK.yar
> Sakura_EK.yar
> Fragus_EK.yar
> Crimepack_EK.yar
> Eleonore_EK.yar
> Blackhole_EK.yar
> BleedingLife_EK.yar
> Angler_EK.yar
> EMAIL_Cryptowall.yar
> malicious_document.yar
> Sanesecurity_spam.yara
> antidebug.yar
> Sanesecurity_sigtest.yara
> 
> 
> I don’t know if all of them would cause clamav to crash or just one particular one.
> 
> I probably downloaded them not long after this came out:
> 
> https://blog.clamav.net/2015/06/clamav-099b-meets-yara.html <https://blog.clamav.net/2015/06/clamav-099b-meets-yara.html>
> 
> The clamav-unofficial-sigs script by eXtremeShok has just re-downloaded Sanesecurity_sigtest.yara and Sanesecurity_spam.yara and clamd is still running, so I presume one of the other files was corrupt?
> 
> James
> 
>> On 10 May 2018, at 11:50 am, Al Varnell <alvarnell at mac.com <mailto:alvarnell at mac.com>> wrote:
>> 
>> I'm guessing those came from some Unofficial signature database you subscribe to as I've never seen any included in the Official database.
>> 
>> -Al-
>> 
>> On Wed, May 09, 2018 at 06:46 PM, James Brown wrote:
>>> Thanks for your replay Al.
>>> 
>>> Have just got it working. This was the clue:
>>> 
>>> Application Specific Information:
>>> Assertion failed: (sp == 0), function yr_execute_code, file yara_exec.c, line 177.”
>>> 
>>> I deleted all the .yar and .yara files from /usr/local/clamav and it started fine (and is still running).
>>> 
>>> Hope this helps someone else.
>>> 
>>> James.
>>> 
>>>> On 10 May 2018, at 11:34 am, Al Varnell <alvarnell at mac.com <mailto:alvarnell at mac.com> <mailto:alvarnell at mac.com <mailto:alvarnell at mac.com>>> wrote:
>>>> 
>>>> OS X 10.7.5 is very old, but I know it's been done successfully for 10.6.8 by using several work-arounds. Looks like you have PCRE working and assume you got over any OpenSSL hurdles. 
>>>> 
>>>> Might help if you posted the output of 
>>>> sudo clamconf
>>>> 
>>>> -Al-
>>>> ClamXAV User
>>>> 
>>>> On Wed, May 09, 2018 at 05:40 PM, James Brown wrote:
>>>>> I upgraded from 0.99.3 (which worked perfectly) to 0.100.0. Everything seemed to work but today I noticed that it wasn’t actually running. No mention of there being a problem in the logs:
>>>>> 
>>>>> Thu May 10 10:01:25 2018 -> +++ Started at Thu May 10 10:01:25 2018
>>>>> Thu May 10 10:01:25 2018 -> Received 0 file descriptor(s) from systemd.
>>>>> Thu May 10 10:01:25 2018 -> clamd daemon 0.100.0 (OS: darwin11.4.2, ARCH: x86_64, CPU: x86_64)
>>>>> Thu May 10 10:01:25 2018 -> Log file size limited to 2097152 bytes.
>>>>> Thu May 10 10:01:25 2018 -> Reading databases from /usr/local/clamav
>>>>> Thu May 10 10:01:25 2018 -> Not loading PUA signatures.
>>>>> Thu May 10 10:01:25 2018 -> Bytecode: Security mode set to "TrustSigned".
>>>>> Thu May 10 10:02:13 2018 -> Loaded 13435987 signatures.
>>>>> Thu May 10 10:02:17 2018 -> LOCAL: Removing stale socket file /tmp/clamd
>>>>> Thu May 10 10:02:17 2018 -> LOCAL: Unix socket file /tmp/clamd
>>>>> Thu May 10 10:02:17 2018 -> LOCAL: Setting connection queue length to 200
>>>>> Thu May 10 10:02:17 2018 -> Limits: Global size limit set to 104857600 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: File size limit set to 26214400 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: Recursion level limit set to 16.
>>>>> Thu May 10 10:02:17 2018 -> Limits: Files limit set to 10000.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxEmbeddedPE limit set to 10485760 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxHTMLNormalize limit set to 10485760 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxHTMLNoTags limit set to 2097152 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxScriptNormalize limit set to 5242880 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxZipTypeRcg limit set to 1048576 bytes.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxPartitions limit set to 50.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxIconsPE limit set to 100.
>>>>> Thu May 10 10:02:17 2018 -> Limits: MaxRecHWP3 limit set to 16.
>>>>> Thu May 10 10:02:17 2018 -> Limits: PCREMatchLimit limit set to 100000.
>>>>> Thu May 10 10:02:17 2018 -> Limits: PCRERecMatchLimit limit set to 5000.
>>>>> Thu May 10 10:02:17 2018 -> Limits: PCREMaxFileSize limit set to 26214400.
>>>>> Thu May 10 10:02:17 2018 -> Archive support enabled.
>>>>> Thu May 10 10:02:17 2018 -> Archive: Blocking encrypted archives.
>>>>> Thu May 10 10:02:17 2018 -> BlockMax heuristic detection disabled.
>>>>> Thu May 10 10:02:17 2018 -> Algorithmic detection enabled.
>>>>> Thu May 10 10:02:17 2018 -> Portable Executable support enabled.
>>>>> Thu May 10 10:02:17 2018 -> ELF support enabled.
>>>>> Thu May 10 10:02:17 2018 -> Mail files support enabled.
>>>>> Thu May 10 10:02:17 2018 -> Mail: RFC1341 handling enabled.
>>>>> Thu May 10 10:02:17 2018 -> OLE2 support enabled.
>>>>> Thu May 10 10:02:17 2018 -> OLE2: Blocking all VBA macros.
>>>>> Thu May 10 10:02:17 2018 -> PDF support enabled.
>>>>> Thu May 10 10:02:17 2018 -> SWF support enabled.
>>>>> Thu May 10 10:02:17 2018 -> HTML support enabled.
>>>>> Thu May 10 10:02:17 2018 -> XMLDOCS support enabled.
>>>>> Thu May 10 10:02:17 2018 -> HWP3 support enabled.
>>>>> Thu May 10 10:02:17 2018 -> Self checking every 600 seconds.
>>>>> Thu May 10 10:02:17 2018 -> Set stacksize to 1048576
>>>>> 
>>>>> Mac OS cash report:
>>>>> 
>>>>> <clamd_2018-05-10-100246_localhost.crash>
>>>>> 
>>>>> Most useful part is probably this:
>>>>> 
>>>>> "Crashed Thread:  2
>>>>> 
>>>>> Exception Type:  EXC_CRASH (SIGABRT)
>>>>> Exception Codes: 0x0000000000000000, 0x0000000000000000
>>>>> 
>>>>> Application Specific Information:
>>>>> Assertion failed: (sp == 0), function yr_execute_code, file yara_exec.c, line 177."
>>>>> 
>>>>> 
>>>>> Any suggestions?
>>>>> 
>>>>> Thanks,
>>>>> 
>>>>> James



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