Re: IMAP Qualcomm WorldMail IMAP Literal Token Parsing Buffer Overflow

[Joel Esler <jesler () sourcefire com>]

I don't know where you got that rule from, but it's different from ours:

alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"IMAP Qualcomm WorldMail IMAP Literal Token Parsing Buffer Overflow"; 
flow:established,to_server; flowbits:isset,qualcom.worldmail.ok; dsize:>668; metadata:policy balanced-ips drop, policy 
security-ips drop, service imap; reference:bugtraq,15980; reference:cve,2005-4267; classtype:attempted-admin; 
sid:17328; rev:1;)

Which depends upon this rule:

alert tcp $HOME_NET 143 -> $EXTERNAL_NET any (msg:"IMAP Qualcomm WorldMail Server Response"; 
flow:established,to_client; content:"WorldMail IMAP4 Server"; fast_pattern:only; nocase; 
flowbits:set,qualcom.worldmail.ok; flowbits:noalert; metadata:service imap; classtype:protocol-command-decode; 
sid:17327; rev:6;)

J

On Mar 25, 2012, at 3:35 PM, Yew Chuan Ong wrote:

> Hye guys,
>
> I experienced lots of FPs with this sig - IMAP Qualcomm WorldMail IMAP Literal Token Parsing Buffer Overflow.
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"IMAP Qualcomm WorldMail IMAP
> Literal Token Parsing Buffer Overflow"; flow:established,to_server; dsize:>668;
> metadata:policy balanced-ips drop, policy security-ips drop, service imap; refer
> ence:bugtraq,15980; reference:cve,2005-4267; classtype:attempted-admin; sid:1732
> 8; rev:1;)
>
> When I checked on the payloads, these are just normal email contents (not suspicious). I am wondering why the packet 
> size is more than 668 bytes if it is not a real buffer overflow attempt. Any ideas? Thanks.
>
>
> Regards
> Yew Chuan
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