[Emerging-Sigs] Bash 0-day

Will Metcalf wmetcalf at emergingthreatspro.com
Thu Sep 25 15:29:22 EDT 2014


Already done :)... Will go out today.

Regards,

Will

On Thu, Sep 25, 2014 at 2:19 PM, Jake Warren <jake.warren at masergy.com>
wrote:

> Thanks for sharing Liam. Looks like the DHCP sigs will need to be
> reworked.
>
> Jake
>
>
>
> On Thu, Sep 25, 2014 at 2:11 PM, Liam Randall <liam.randall at gigaco.com>
> wrote:
>
>> DHCP is out:
>>
>> https://www.trustedsec.com/september-2014/shellshock-dhcp-rce-proof-concept/
>>
>> Liam
>>
>> On Thu, Sep 25, 2014 at 3:06 PM, Will Metcalf <
>> wmetcalf at emergingthreatspro.com> wrote:
>>
>>> Collapsing these into a single rule without specific option.
>>>
>>> Regards,
>>>
>>> Will
>>>
>>> On Wed, Sep 24, 2014 at 4:59 PM, Jake Warren <jake.warren at masergy.com>
>>> wrote:
>>>
>>>> Here's my attempt at some rules for the cgi attack vector. Poorly
>>>> written rules with horrible performance but they do at least catch the
>>>> initial PoC attacks. :-)
>>>>
>>>> alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"Possible
>>>> CVE-2014-6271 exploit attempt via HTTP headers"; content:"|28|";
>>>> http_header; content:"|29|"; http_header; distance:0; within:10;
>>>> content:"|7b|"; http_header; distance:0; within:10; content:"|3a|";
>>>> http_header; distance:0; within:10; content:"|3b|"; http_header;
>>>> distance:0; within:10; content:"|7d|"; http_header; fast_pattern;
>>>> distance:0; within:10; content:"|3b|"; http_header; distance:0; within:10;
>>>> classtype:web-application-attack; reference:cve,2014-6271; sid:xxxx; rev:1;)
>>>>
>>>> alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"Possible
>>>> CVE-2014-6271 exploit attempt via HTTP URI"; content:"|28|"; http_uri;
>>>> content:"|29|"; http_uri; distance:0; within:10; content:"|7b|"; http_uri;
>>>> distance:0; within:10; content:"|3a|"; http_uri; distance:0; within:10;
>>>> content:"|3b|"; http_uri; distance:0; within:10; content:"|7d|"; http_uri;
>>>> fast_pattern; distance:0; within:10; content:"|3b|"; http_uri; distance:0;
>>>> within:10; classtype:web-application-attack; reference:cve,2014-6271;
>>>> sid:xxxx; rev:1;)
>>>>
>>>> -Jake Warren
>>>>
>>>>
>>>> On Wed, Sep 24, 2014 at 12:54 PM, Darien Huss <
>>>> dhuss at emergingthreats.net> wrote:
>>>>
>>>>> Thanks Cooper, we should have something going out today for this.
>>>>>
>>>>> Regards,
>>>>> Darien
>>>>>
>>>>> On Wed, Sep 24, 2014 at 1:33 PM, Cooper F. Nelson <cnelson at ucsd.edu>
>>>>> wrote:
>>>>>
>>>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>>>> Hash: SHA1
>>>>>>
>>>>>> This popped up on one of my mailing lists today:
>>>>>>
>>>>>> >
>>>>>> https://securityblog.redhat.com/2014/09/24/bash-specially-crafted-environment-variables-code-injection-attack/
>>>>>>
>>>>>> This is an example of the exploit code:
>>>>>>
>>>>>> > $ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
>>>>>> >  vulnerable
>>>>>> >  this is a test
>>>>>>
>>>>>> I'm not sure of what would be the best way to detect this, as its
>>>>>> potentially exploitable via multiple ports/protocols and I suspect
>>>>>> trivial to obfuscate.
>>>>>>
>>>>>> - --
>>>>>> Cooper Nelson
>>>>>> Network Security Analyst
>>>>>> UCSD ACT Security Team
>>>>>> cnelson at ucsd.edu x41042
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>>>>>> -----END PGP SIGNATURE-----
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>>>>>>
>>>>>
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>>>>>
>>>>
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>
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