[Emerging-Sigs] Bash 0-day

Liam Randall liam.randall at gigaco.com
Thu Sep 25 15:11:42 EDT 2014


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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