[Snort-sigs] SID 8440: IMAP SSLv2 openssl get shared ciphers overflow attempt
bmc at ...95...
Thu Nov 9 12:49:56 EST 2006
On Tue, Nov 07, 2006 at 02:22:14PM -0600, Paul Schmehl wrote:
> I'm getting a boatload of alerts from one host for this SID. The rule
> looks for [01 03] (SOH followed by ETX) at a depth of 2 bytes. Every
> single packet that triggers this alert begins with this sequence: 17 03 01
> 03 80
> ETB ETX SOH ETX followed by a high ascii character. So, End of
> Transmission Block, End of Text, Start of Heading, End of Text, high ascii.
> Any of you uber-geeks want to translate what this host is doing? Or
> attempting to do? (BTW, I suspect this is "benign" activity. The source
> host is on a local ISP's network, and the dest host is our imap server.
> The alerts are triggered every two minutes, give or take a hundredth of a
> second, so it looks like aggressive mail checking.)
> Is this a broken client? Eeeevvviiilll?
IIRC, I wrote those rules. Send me pcap. I'll take a look.
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