TLS renegotiation authentication GAP. Yes, it is really a serious vulnerability
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- Alice Strickland
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1 TLS renegotiation authentication GAP Yes, it is really a serious vulnerability
2 Agenda» Why do we use TLS/SSL? A typical SSL session» What is renegotiation? An SSL renegotiated session» The attack» The consequences Ordering pizza Stealing twitter passwords» The (lack of) patches
3 Why do we use TLS/SSL?» TLS is intended to provide: Confidentiality Integrity Non repudiation» Intended to secure communication over an non-trusted channel» Certificates prove identity of Server (and client) and should make MitM attacks impossible
4 A typical SSL Session
5 What is renegotiation? Client and server are allowed to initiate renegotiation of the session encryption in order to:» Refresh keys» Increase authentication» Increase cipher strength» Any other reason they see fit Renegotiation happens if client or server sends a hello message E.g. a webserver has some directories that require certificate authentication and some that don t
6 A typical renegotiated SSL session
7 A typical renegotiated SSL session
8 The attack No cipher context MitM cipher context
9 The attack No cipher context MitM cipher context Client cipher context
10 The consequences Integrity of the original request» Attacker can insert data (text) in front of anydata sent by client Integrity of reply» Attacker cannot modify reply, but can prevent that reply reaches client Confidentiality» Attacker cannot decrypt request or reply Non repudiation» It can not longer be guaranteed that therequest is the request intended by client, even when client certificates are used
11 The consequences - Ordering pizza Normal pizza ordering query: GET /pizza?toppings=ansjovis;address=andrzejs%20place\n Cookie: andrzejwillpayyourpizza\n \n Attacker sends: GET /pizza?toppings=pepperoni;address=franks%20place\n X-ignore-next: Query becomes: GET /pizza?toppings=pepperoni;address=franks%20place\n X-ignore-next: GET /pizza?toppings=ansjovis;address=andrzejs%20place\n Cookie: andrzejwillpayyourpizza\n \n
12 The consequences - Stealing twitter passwords Confidentiality wasn t broken, but still passwords where stolen. Here s how I think they did it Victim message: POST /statusses/update.xml\n Authorisation: Basic <victims base 64 creds>\n User-agent: <some user agent> Status=Victims status\n Etc.. Injected message: POST /statusses/update.xml\n Authentication-basic: <attacker creds>\n Status=
13 Consequences - Stealing twitter passwords Becomes: POST /statusses/update.xml\n Authentication-basic: <attacker creds>\n Status=POST /statusses/update.xml\n Authorisation: Basic <victims base 64 creds>\n User-agent: <some user agent> Status=Victims status\n Etc..
14 The consequences - Stealing twitter passwords
15 The (lack of) patches (as of ) IETF» There is a proposed draft that addresses this issue (Draf Rescorla TLS renegotiation 01) OpenSSL» Workaround (disable renegotiation) is available for download (OpenSSL 0.9.8l)» Fix (based on rescorla draft) is being tested (OpenSSL 0.9.8m) Microsoft» Currently testing interoperability» ISS6 and IIS7 not vulnerable for client initiated renegotiation Cisco» Initial testing stage F5» Workaround is availble (disable renegotiation completly)» Fix in initial testing stage Mozilla/Firefox/Thunderbird/NSS» Initial testing Sun» Initial testing GNU utils» Mostly not affected» Initial testing RSA BSAFE suite» Limited beta Opera» Initial testing
16 Sources March Ray:» Phonefactor» Ekron» Anil Kurmus» F5»
17 Questions?
18 Want to know more? Frank Breedijk» Security Engineer at Schuberg Philis» Author of AutoNessus» Blogger for CupFigther.net Blog: Project:
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