[Emerging-Sigs] Bash 0-day

Jake Warren jake.warren at masergy.com
Thu Sep 25 15:19:00 EDT 2014


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
>>>>> -----BEGIN PGP SIGNATURE-----
>>>>> Version: GnuPG v2.0.17 (MingW32)
>>>>>
>>>>> iQEcBAEBAgAGBQJUIwBXAAoJEKIFRYQsa8FW3+4H/3qMEZ5MirfKyd21/TyyWXgy
>>>>> BLiIlNojmmB/xG+vcgjI9efTY+i6+6gE4zPl0ID6EOU89m/oCEcghO9zw09arO3H
>>>>> YmFeJRZjpIK3iym+FGZMIDvo2F4tt76Oo+58wWxYqkNjYUKWVde6e18wp15hPx/L
>>>>> Uy1S1Ec3AozhEjNcFgUR6vI7hRz+bmEv5Qa2dLfsiEuWBkJvTw9wYnHYjFgrNMOm
>>>>> 3w6lyJmkOC2R+/A0CD436IbnEg55uSwL6kE0pdGfmx4b9kHpJ9Wauj3lLsUUo/PF
>>>>> ja0FhmeGhtfjzrSlJXw7mWUKXMujPviYZswzGZWyQknfktFwHLKplM+cz4LBaZQ=
>>>>> =VV4h
>>>>> -----END PGP SIGNATURE-----
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