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I've just started seeing this appearing in our server logs...

/P/2112/FBA73F59E6F7E78CCFF29DD8BDF46ECCAE5B73145E023BFB207C971E835645245C62CA0296DA6CDA4E62613A9C10C0DADBA941D2AD68005E57EFDC84A8ECD0ADC37C0214AD76755E48D6D1BAABF

It goes on and on for a while. In fact that's less than 10% of just one such event and there are many similar events.

I'm suspecting some attempted hack since we have no folder named "/P/" on our server.

Does anyone recognise this?

BTW, the reason I was looking at the logs at that time was that our server had just crashed, and I can't help wondering if it's related.

The server is Apache/2.0.54 (Unix) PHP/4.4.2 mod_ssl/2.0.54 OpenSSL/0.9.7a JRun/4.0

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2 Answers 2

up vote 4 down vote accepted

Looks like a buffer overflow shellcode attack. I'd expect that the URL is at least 4096 chars long. The HTTP RFC does not specify a maximum URL length, although there are implicit limitations on most of the major servers, so the attacker may be attempting to cause a buffer overflow.

I'd make sure you've read the release notes for your current web server, and check that there are no outstanding security issues.

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What's the source IP? Possible that it's some kind of DoS attack or attempt at a buffer overflow. Can you post the entire line?

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[Tue Jun 02 14:06:24 2009] [info] [client 172.16.98.242] Spelling fix: /P/448/FBA73F59E6F7E78CCFF29DD8BDF46ECCE0B5E872557872C99849F03E5825BD858ECB22A02‌​F3F899EBDA8CC1D67AC24D8CE9E9670742817BD30834A95C3DCD5CCCA40C2CEFAD205FDC647FDBB64‌​7E954C0DF5A5817DFF928C830714F8849D409110BB65E7D1C007F5D139E843C3679DD9C28DFAA794A‌​BF1CC232E7224A2ACCBBC1A3A3F8A4670EABFF98D5A0CB61914ADC1A1799661C8EB872ADB92657217‌​6698F360A219026C8E10180333B9823A2DCB74C9FB8B276B668A57C95C28D9AE3D2FA93A872F706A8‌​39836CBAC09E920420002F95CE948C1E8D0EC6092435FC9A24D: 2 candidates (We are using mod_spelling) –  nedlud Jun 2 '09 at 4:38
    
There are dozens of these requests from the same machine –  nedlud Jun 2 '09 at 4:40
    
It's a private network (172.16.*.*), do you use these in your company? Otherwise it might be somehow spoofed... –  drybjed Jun 2 '09 at 5:05
    
Yeah, it's an internal address, so I assume we have an infected machine on the inside of the network. –  nedlud Jun 2 '09 at 5:09
1  
Go to it and plug it off the network physically. Don't turn it off, you might want to check how it was hacked first. –  drybjed Jun 2 '09 at 5:14

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