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              "value": "Issue summary: Calling the OpenSSL API function SSL_select_next_proto with an\u003cbr\u003eempty supported client protocols buffer may cause a crash or memory contents to\u003cbr\u003ebe sent to the peer.\u003cbr\u003e\u003cbr\u003eImpact summary: A buffer overread can have a range of potential consequences\u003cbr\u003esuch as unexpected application beahviour or a crash. In particular this issue\u003cbr\u003ecould result in up to 255 bytes of arbitrary private data from memory being sent\u003cbr\u003eto the peer leading to a loss of confidentiality. However, only applications\u003cbr\u003ethat directly call the SSL_select_next_proto function with a 0 length list of\u003cbr\u003esupported client protocols are affected by this issue. This would normally never\u003cbr\u003ebe a valid scenario and is typically not under attacker control but may occur by\u003cbr\u003eaccident in the case of a configuration or programming error in the calling\u003cbr\u003eapplication.\u003cbr\u003e\u003cbr\u003eThe OpenSSL API function SSL_select_next_proto is typically used by TLS\u003cbr\u003eapplications that support ALPN (Application Layer Protocol Negotiation) or NPN\u003cbr\u003e(Next Protocol Negotiation). NPN is older, was never standardised and\u003cbr\u003eis deprecated in favour of ALPN. We believe that ALPN is significantly more\u003cbr\u003ewidely deployed than NPN. The SSL_select_next_proto function accepts a list of\u003cbr\u003eprotocols from the server and a list of protocols from the client and returns\u003cbr\u003ethe first protocol that appears in the server list that also appears in the\u003cbr\u003eclient list. In the case of no overlap between the two lists it returns the\u003cbr\u003efirst item in the client list. In either case it will signal whether an overlap\u003cbr\u003ebetween the two lists was found. In the case where SSL_select_next_proto is\u003cbr\u003ecalled with a zero length client list it fails to notice this condition and\u003cbr\u003ereturns the memory immediately following the client list pointer (and reports\u003cbr\u003ethat there was no overlap in the lists).\u003cbr\u003e\u003cbr\u003eThis function is typically called from a server side application callback for\u003cbr\u003eALPN or a client side application callback for NPN. In the case of ALPN the list\u003cbr\u003eof protocols supplied by the client is guaranteed by libssl to never be zero in\u003cbr\u003elength. The list of server protocols comes from the application and should never\u003cbr\u003enormally be expected to be of zero length. In this case if the\u003cbr\u003eSSL_select_next_proto function has been called as expected (with the list\u003cbr\u003esupplied by the client passed in the client/client_len parameters), then the\u003cbr\u003eapplication will not be vulnerable to this issue. If the application has\u003cbr\u003eaccidentally been configured with a zero length server list, and has\u003cbr\u003eaccidentally passed that zero length server list in the client/client_len\u003cbr\u003eparameters, and has additionally failed to correctly handle a \"no overlap\"\u003cbr\u003eresponse (which would normally result in a handshake failure in ALPN) then it\u003cbr\u003ewill be vulnerable to this problem.\u003cbr\u003e\u003cbr\u003eIn the case of NPN, the protocol permits the client to opportunistically select\u003cbr\u003ea protocol when there is no overlap. OpenSSL returns the first client protocol\u003cbr\u003ein the no overlap case in support of this. The list of client protocols comes\u003cbr\u003efrom the application and should never normally be expected to be of zero length.\u003cbr\u003eHowever if the SSL_select_next_proto function is accidentally called with a\u003cbr\u003eclient_len of 0 then an invalid memory pointer will be returned instead. If the\u003cbr\u003eapplication uses this output as the opportunistic protocol then the loss of\u003cbr\u003econfidentiality will occur.\u003cbr\u003e\u003cbr\u003eThis issue has been assessed as Low severity because applications are most\u003cbr\u003elikely to be vulnerable if they are using NPN instead of ALPN - but NPN is not\u003cbr\u003ewidely used. It also requires an application configuration or programming error.\u003cbr\u003eFinally, this issue would not typically be under attacker control making active\u003cbr\u003eexploitation unlikely.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.\u003cbr\u003e\u003cbr\u003e\n\nDue to the low severity of this issue we are not issuing new releases of\u003cbr\u003eOpenSSL at this time. The fix will be included in the next releases when they\u003cbr\u003ebecome available."
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