Nmap Development mailing list archives
Re: Conficker scanning with nmap
From: David Fifield <david () bamsoftware com>
Date: Wed, 1 Apr 2009 09:17:25 -0600
On Wed, Apr 01, 2009 at 08:41:17AM +0000, Brandon Enright wrote:
Brandon Enright <bmenrigh () ucsd edu> writes:evp_enc.c(282): OpenSSL internal error, assertion failed: inl > 0I managed to isolate the problem. It lies in nse_openssl.cc, in the function l_encrypt which is sometimes called with an empty string. In this case, data_len is 0 and the following: EVP_EncryptUpdate( &cipher_ctx, out, &out_len, data, data_len ) triggers the fatal error from OpenSSL: evp_enc.c(261): OpenSSL internal error, assertion failed: inl > 0 Cheers, LionelExcellent digging. I'll probably be able to work backwards from here to figure out why tomorrow. I'm assuming that the error is triggered in "NSE: SMB: Creating NTLMv1 response". Ron might be able to think of a case where this would happen too.
I can reproduce this with OpenSSL 0.9.8e and the attached sample script. The error only happens for me when encrypting an empty string, not decrypting one. I think you're right about where the problem occurs. It could happen when the server sends a zero-length challenge. The challenge comes from line 615 of smbauth.lua. It looks like it could be caused by a truncated packet. David Fifield
Attachment:
ssl-test.nse
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Current thread:
- Re: Conficker scanning with nmap Lionel Cons (Apr 01)
- Re: Conficker scanning with nmap Brandon Enright (Apr 01)
- Re: Conficker scanning with nmap Lionel Cons (Apr 01)
- Re: Conficker scanning with nmap David Fifield (Apr 01)
- Re: Conficker scanning with nmap Ron (Apr 01)
- Re: Conficker scanning with nmap David Fifield (Apr 01)
- Re: Conficker scanning with nmap Lionel Cons (Apr 02)
- Re: Conficker scanning with nmap Ron (Apr 02)
- Re: Conficker scanning with nmap Brandon Enright (Apr 01)