SSL\/TLS\u534f\u8bae\u7684\u6f14\u5316 10\u2013\u5b89\u5168\u95ee\u9898 \u2013 SSLv3\u7684POODLE\u653b\u51fb
\n\u53d1\u8868\u56de\u590d<\/p>\n
image<\/p>\n
1.\u6709\u8da3\u7684POODLE<\/p>\n
POODLE\u662fPadding Oracle On Downgraded Legacy Encryption\u7684\u7f29\u5199\uff0c\u4e0d\u77e5\u662f\u5de7\u5408\u8fd8\u662f\u6709\u610f\uff0c\u5728\u82f1\u6587\u4e2dPoodle\u7684\u610f\u601d\u662f\u8d35\u5bbe\u72ac\uff0c\u4e8e\u662f\u8001\u5916\u5728\u5199POODLE\u653b\u51fb\u76f8\u5173\u6587\u5b57\u7684\u65f6\u5019\uff0c\u7528\u8fd9\u79cd\u6f02\u4eae\u7684\u5c0f\u72d7\u505a\u914d\u56fe\u3002\u7ed9\u4eba\u7684\u611f\u89c9\u662f\uff0c\u8fd9\u5c0f\u72d7\u662fSSL\u7684\u5409\u7965\u7269\u3002<\/p>\n
\u8001\u5916\u7684\u4e00\u4e2a\u4e60\u60ef\u5c31\u662f\uff0c\u65e0\u8bba\u505a\u4ec0\u4e48\u9879\u76ee\uff0c\u90fd\u8981\u4e8b\u5148\u8d77\u4e00\u4e2a\u54cd\u4eae\u7684\u540d\u5b57(\u4f3d\u5229\u7565\u8ba1\u5212\u4e4b\u7c7b)\u6216\u8005\u641e\u4e00\u4e2a\u7f29\u5199(\u5c31\u50cfSSL)\u3002POODLE\u65e2\u662f\u7f29\u5199\u53c8\u662f\u9753\u540d\uff0c\u5f88\u5bb9\u6613\u5c31\u626c\u540d\u5929\u4e0b\u4e86\u3002\u8fd9\u4e00\u62db\u6211\u4eec\u5f88\u5feb\u5c31\u5b66\u4f1a\u4e86\uff0c\u4f8b\u5982\u767e\u5ea6\u51e4\u5de2\u7684\u3002<\/p>\n
POODLE\u653b\u51fb\u662fGoogle\u7684\u7814\u7a76\u545814\u5e749\u6708\u53d1\u73b0\u7684\uff0c\u7b97\u662f\u65b0\u653b\u51fb\u4e86\uff0c\u6587\u6863\u662f\u3010POODLE\u3011\u3002\u653b\u51fb\u7684\u7814\u7a76\u8005\u4e5f\u662f2011\u5e74BEAST\u653b\u51fb\u7684\u53d1\u73b0\u8005\u3002POODLE\u4ec5\u4ec5\u9488\u5bf9SSLv3\uff0c\u4f46\u5b83\u672c\u8d28\u4e0a\u548cBEAST\u653b\u51fb\u5f88\u7c7b\u4f3c\uff1a<\/p>\n
1.\u9488\u5bf9CBC\u6a21\u5f0f\u5757\u52a0\u5bc6\u7684\u7f3a\u9677\u3002<\/p>\n
2.\u76ee\u7684\u662f\u6062\u590dcookie\u4e2d\u7684\u654f\u611f\u4fe1\u606f<\/p>\n
3.\u731c\u6d4b\u7684\u65b9\u5f0f\u662f\u4e00\u4e2abyte\u4e00\u4e2abyte\u7684\u9009\u62e9\u660e\u6587\u6ce8\u5165\u3002<\/p>\n
4.\u964d\u7ef4\u6253\u51fb\uff1a\u5229\u7528POODLE\u7f3a\u9677\uff0c\u731c\u6d4bn\u4e2abyte\u9700\u8981\u53d1\u9001\u7684\u63a2\u6d4b\u6b21\u6570\u662fO(n)\uff0c\u5373\u6bcf\u4e2an byte\u9700\u8981256*n\u6b21\u3002\u5982\u679c\u6ca1\u6709\u8fd9\u79cd\u7f3a\u9677\uff0c\u4ec5\u4ec5bruteforce\u65b9\u5f0f\u731c\u6d4b\uff0c\u9700\u89812^(8*n)\u6b21\u3002<\/p>\n
\u4f46\u64cd\u4f5c\u66f4\u7b80\u5355\uff0c\u800c\u4e14\u6ca1\u6709\u50cfBEAST\u90a3\u6837\u7684workaround\uff0c\u53ea\u80fd\u5347\u7ea7\u534f\u8bae\u3002<\/p>\n
2.\u653b\u51fb\u539f\u7406<\/p>\n
POODLE\u4ec5\u4ec5\u9488\u5bf9SSLv3\uff0c\u800c\u5bf9TLS1.0\u65e0\u6548\uff0c\u5229\u7528SSLv3\u52a0\u5bc6\u5757\u7684Padding\u662f\u968f\u673a\u503c\u8fd9\u4e00\u534f\u8bae\u8bbe\u8ba1\u7f3a\u9677\u3002<\/p>\n
RFC6101 SSLv3\u76845.2.3.2\u5b9a\u4e49\u4e86CBC\u5757\u52a0\u5bc6\u4e0b\u7684SSLv3\u52a0\u5bc6\u5757\u5b9a\u4e49\uff1a<\/p>\n
block-ciphered struct {
\n opaque content[SSLCompressed.length];
\n opaque MAC[CipherSpec.hash_size];\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014->1.\u5bf9Padding\u90e8\u5206\u6ca1\u6709\u5b8c\u6574\u6027\u4fdd\u62a4\uff0c\u8fd9\u91ccMAC\u4fdd\u62a4content\uff0ccontent length\uff0csequence number\u3002
\n uint8 padding[GenericBlockCipher.padding_length];\u2014\u2014\u2014\u2014\u2013>2.padding\u662f\u968f\u673a\u7684\u3002\u770b\u8d77\u6765\u66f4\u4e0d\u5bb9\u88ab\u731c\u6d4b\u5230\uff0c\u5b9e\u9645\u4e0a\u753b\u86c7\u6dfb\u8db3\u4e86\u3002\u968f\u673a\u52a0\u4e0a\u6ca1\u6709\u5b8c\u6574\u6027\u4fdd\u62a4\uff0c\u610f\u5473\u7740\u65e0\u8bba\u8fd9\u90e8\u5206\u6570\u636e\u662f\u4ec0\u4e48\u5185\u5bb9\uff0c\u63a5\u6536\u65b9\u90fd\u4e0d\u4f1a\u5728\u610f\u3002
\n uint8 padding_length;
\n} GenericBlockCipher;<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u53ef\u80fd\u7684HTTP Post\u660e\u6587\u683c\u5f0f\u7684\u4f8b\u5b50\uff0c\u6807\u4e3a\u84dd\u8272\u7684path\u548cbody\u662f\u4e0a\u5c42\u5e94\u7528\u6216\u8005\u8bf4\u653b\u51fb\u8005\u53ef\u4ee5\u63a7\u5236\u7684\u6570\u636e\uff1a<\/p>\n
\u201cPOS T \/path C o o ki e : name=value\u2026 \\ r\\ n\\ r\\ nbody \u2016 20\u00adbyte MAC \u2016 padding\u201d<\/p>\n
\u5047\u5b9a\u52a0\u5bc6\u540e\u5f97\u5230\u5982\u4e0b\u52a0\u5bc6\u5feb\uff0cC1\uff0cC2\u5230Cn\uff0c\uff08C0\u662fIV\u6211\u4eec\u770b\u4e0d\u5230\uff09\uff0c\u5bf9\u4e8e\u7b2ci\u4e2a\u52a0\u5bc6\u5757\uff0c\u5904\u7406\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1.Pi = Dk(Ci) \u2295 Ci-1 \u2013>\u5176\u4e2dk\u662f\u5bc6\u94a5\uff0cDk\u662f\u89e3\u5bc6\u51fd\u6570\uff0cPi\u662f\u89e3\u5bc6\u540e\u7684\u660e\u6587\u3002<\/p>\n
2.\u68c0\u67e5\u5e76\u79fb\u9664Pn\u5c3e\u90e8\u7684padding(Pn\u4e5f\u53ef\u4ee5\u5b8c\u5168\u662fpadding)\u3002<\/p>\n
3.\u68c0\u6d4b\u5e76\u79fb\u9664MAC\uff0c\u5f97\u5230\u4e86\u660e\u6587\u3002<\/p>\n
\u653b\u51fb\u8005\u5e0c\u671b\u901a\u8fc7\u9009\u62e9\u660e\u6587\u6ce8\u5165\uff0c\u8fbe\u5230\u5982\u4e0b\u4e24\u4e2a\u6548\u679c\uff1a<\/p>\n
1.\u901a\u8fc7\u8c03\u6574\u201cpath\u201d\u7684\u957f\u5ea6\uff0c\u4f7f\u5f97cookie\u4e2d\u5c1a\u672a\u88ab\u731c\u6d4b\u51fa\u6765\u7684\u5b57\u8282\u4f4d\u4e8e\u4e0a\u4e00\u4e2a\u5757\u7684\u5c3e\u90e8\uff08\u5047\u8bbe\u5305\u62ec\u8fd9\u4e2a\u5b57\u8282\u7684\u52a0\u5bc6\u5757\u662fCi\uff09\u3002<\/p>\n
2.\u7136\u540e\u8c03\u6574\u201cbody\u201d\u7684\u957f\u5ea6\uff0c\u4f7f\u5f97\u6700\u540e\u4e00\u4e2a\u5757\uff08Cn\uff09\u90fd\u662fpadding\uff08\u4e5f\u5c31\u662f\u6574\u4e2aPost\u957f\u5ea6\u662fblock\u7684\u6574\u6570\u500d\uff09\u3002<\/p>\n
\u8fd9\u663e\u7136\u662f\u53ef\u4ee5\u505a\u5230\u7684\u3002<\/p>\n
\u4e4b\u540e\u653b\u51fb\u8005\u4fdd\u5b58Ci\uff0c\u66ff\u6362\u6700\u540e\u7684Cn\uff0c\u53d1\u9001\u5230Server\u3002\u5047\u8bbepadding\u662f\u968f\u673a\u586b\u5145\u7684\uff0c\u53ea\u8981\u8ba1\u7b97\u4e4b\u540e\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u78b0\u649e\u6210\u529f\uff0c\u5219\u6574\u4e2a\u62a5\u6587\u53ef\u4ee5\u6b63\u786e\u53d1\u9001\u51fa\u53bb\u3002\u5047\u8bbe\u6bcf\u4e2ablock\u662f16\u5b57\u8282\uff0c\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u662fCi[15]\u3002\u5219<\/p>\n
Dk(Ci)[15] \u2295 Cn\u00ad-1[15] = 15 \/*15\u662fpadding length*\/<\/p>\n
\u53c8\u6839\u636e\u524d\u9762\u7684\u516c\u5f0f\uff1a<\/p>\n
Pi = Dk(Ci) \u2295 Ci-1 <\/p>\n
\u5219<\/p>\n
15 \u2295 Cn\u00ad1[15] \u2295 Ci-\u00ad1[15] = Cn\u00ad1[15] \u2295 Ci-\u00ad1[15] \u2295 Dk(Ci)[15] \u2295 Cn\u00ad-1[15] = Ci-\u00ad1[15] \u2295 Dk(Ci)[15] = Pi[15]<\/p>\n
\u2014->\u8fd9\u6837\u5c31\u89e3\u51fa\u6765\u6700\u540e\u4e00\u4e2a\u5b57\u8282<\/p>\n
\u8fd9\u91cc\u56e0\u4e3a\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u6bcf\u4e2a\u6570\u503c\u5c1d\u8bd5\u4e00\u6b21\uff0c\u53ea\u80fd\u8bf4\u7edf\u8ba1\u5b66\u4e0a\u8bb2\uff0c256\u6b21\u5c1d\u8bd5\u4e4b\u540e\uff0c\u4f1a\u78b0\u4e0a\u4e00\u6b21\u3002<\/p>\n
3.\u9632\u8303\u63aa\u65bd \u2013 TLS SCVS<\/p>\n
\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7a7a\u7684\u52a0\u5bc6\u5957\u4ef6TLS_FALLBACK_SCSV {0x56, 0x00}\uff0c\u5982\u679cClient\u8fd9\u6b21\u7528\u7684\u7248\u672c\u53f7\u4f4e\u4e8e\u81ea\u5df1\u6700\u9ad8\u652f\u6301\u7684\u7248\u672c\u597d\uff0c\u5fc5\u987b\u643a\u5e26\u8fd9\u4e2a\u4fe1\u4ee4\u3002Client\u5229\u7528\u8fd9\u4e2a\u6807\u8bb0\u544a\u8bc9Server\uff0c\u6211\u56e0\u4e3a\u4e0a\u6b21\u8fde\u63a5\u5931\u8d25\uff0c\u88ab\u4f60\u8981\u6c42\u7248\u672c\u4e86\u3002Server\u5982\u679c\u53d1\u73b0\uff0c\u81ea\u5df1\u6ca1\u6709\u964d\u4f4eClient\u7684\u7248\u672c\uff0c\u5219\u4e00\u5b9a\u6709\u4e2d\u95f4\u4eba\u653b\u51fb\uff0c\u4eba\u4e3a\u964d\u4f4e\u4e86\u524d\u9762Client\u53d1\u9001\u7684\u7248\u672c\u597d\uff0c\u8bd5\u56fe\u653b\u51fb\u3002<\/p>\n
\u4ec0\u4e48\u65f6\u5019\u8fd9\u4e2a\u6269\u5c55\u4e0d\u7ba1\u7528\uff1a<\/p>\n
1.\u6709\u4e00\u65b9\u786e\u5b9e\u6700\u9ad8\u4ec5\u4ec5\u652f\u6301SSLv3\u3002<\/p>\n
2.\u6709\u4e00\u65b9\u4e0d\u652f\u6301\u8fd9\u4e2a\u6269\u5c55\u3002<\/p>\n
\u770b\u5230\u8fd9\u79cd\u65b9\u6cd5\uff0c\u6211\u7684\u7b2c\u4e00\u53cd\u5e94\u662f\uff0c\u5982\u679c\u4e2d\u95f4\u4eba\u4ece\u4e24\u8fb9\u7684\u534f\u5546\u4e2d\u5168\u90e8\u5265\u79bb\u8fd9\u4e2a\u4fe1\u4ee4\u600e\u4e48\u529e\uff1f\u540e\u6765\u60f3\u660e\u767d\u4e86\uff0c\u524d\u51e0\u5929\u88ab\u6211\u8ba4\u4e3a\u72d7\u8840\u7684Session Hash\uff0c\u8fd9\u91cc\u8d77\u4f5c\u7528\u4e86\u3002\u56e0\u4e3a\u5b83\u68c0\u67e5\u6240\u6709\u53d1\u51fa\u53bb\u7684\u63e1\u624b\u62a5\u6587\u7684\u5b8c\u6574\u6027\uff0c\u4e2d\u95f4\u4eba\u65e0\u6cd5\u6b3a\u9a97\u4e86\uff08\u5f85\u786e\u8ba4\uff09\u3002<\/p>\n
\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\u662f\u4e3a\u4ec0\u4e48\u4e0d\u7528\u6807\u51c6\u6269\u5c55\u65b9\u5f0f\u800c\u7528\u4e86\u4e00\u4e2a\u7279\u6b8a\u7684\u52a0\u5bc6\u5957\u4ef6\u8fd9\u79cdTricky\u7684\u624b\u6bb5\uff0c\u540e\u6765\u4e5f\u60f3\u660e\u767d\u4e86\uff0cTLS\u5bf9\u8fd9\u79cd\u653b\u51fb\u514d\u75ab\uff0c\u56e0\u6b64\u5fc5\u987b\u8981SSLv3\u652f\u6301\u8fd9\u79cd\u6269\u5c55\uff0c\u800c\u53c8\u4e0d\u80fd\u4fee\u6539\u5df2\u6709\u7684SSLv3\u5b9e\u73b0\uff0c\u7528\u7279\u6b8a\u52a0\u5bc6\u5957\u4ef6\u8fd9\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u6700\u5c11\u4ee3\u7801\u5347\u7ea7\u7684\u6269\u5c55\u3002<\/p>\n
4.\u4e3a\u4ec0\u4e48TLS1.0\u53ef\u4ee5\u514d\u75ab<\/p>\n
\u6211\u4eec\u770b\u770bTLS1.0\u534f\u8bae\u7684\u90a3\u4e00\u90e8\u5206\u7684\u6539\u52a8\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898<\/p>\n
RFC2246 TLS1.0\u91cc\u9762\u76f8\u5173\u6570\u636e\u7ed3\u6784\u6ca1\u6709\u53d8\u5316\uff0cMAC\u4f9d\u7136\u65e0\u6cd5\u4fdd\u62a4padding\uff0c\u4f46\u662fpadding\u7684\u5185\u5bb9\u6709\u4e86\u89c4\u5b9a\uff1a<\/p>\n
\u201cEach uint8 in the padding data vector must be filled with the padding length value.\u201d<\/p>\n
\u4e5f\u5c31\u662f\uff0cpadding\u90e8\u5206\u88ab\u586b\u5145\u6210\u4e3apadding length\u7684\u503c\u3002\u5047\u8bbepadding\u67097byte\uff0c\u5219\u8fde\u540cpadding length\u76848\u4e2abytes\u7684\u5185\u5bb9\u662f\u201c7\uff0c7\uff0c7\uff0c7\uff0c7\uff0c7\uff0c7\uff0c7\u201d\uff0c\u8fd9\u6837\u66ff\u6362padding\u5185\u5bb9\u4f1a\u88ab\u53d1\u73b0\uff0c\u653b\u51fb\u5f3a\u5ea6\u7b49\u540c\u4e8e\u66b4\u529b\u7834\u89e3\u3002<\/p>\n
\u3010\u53c2\u8003\u3011<\/p>\n
1.POODLE, https:\/\/www.openssl.org\/~bodo\/ssl-poodle.pdf<\/p>\n
2.BEAST\uff0c\u706b\u72d0\u6d4f\u89c8\u5668\u5206\u5272HTTPS\u62a5\u6587\u7684\u95ee\u9898\uff0chttp:\/\/www.unclekevin.org\/?p=38<\/p>\n
3.TLS SCVS \u2013 TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade Attacks\uff0cdraft-ietf-tls-downgrade-scsv-05\uff0chttps:\/\/datatracker.ietf.org\/doc\/draft-ietf-tls-downgrade-scsv\/?include_text=1
\n\u672c\u6761\u76ee\u53d1\u5e03\u4e8e2015\u5e743\u67086\u65e5\u3002\u5c5e\u4e8eSSL\/TLS\u3001\u5b89\u5168\u3001\u7f51\u7edc\u534f\u8bae\u5206\u7c7b\u3002<\/p>\n
http:\/\/support.fortinet.com.cn\/uploadfile\/2015\/0513\/20150513020838240.pdf<\/a><\/p>\n SSL 3.0 POODLE SSL 3.0 POODLE SSL 3.0 POODLESSL 3.0 POODLE SSL 3.0 POODLE SSL 3.0 POODLE \u6f0f\u6d1e SSL\/TLS\u534f\u8bae\u7684\u6f14\u5316 10\u2013\u5b89\u5168\u95ee\u9898 \u2013 SSLv3\u7684POODLE\u653b\u51fb \u53d1\u8868 … \u7ee7\u7eed\u9605\u8bfb
\n\u7248\u672c
\n1.0
\n\u65f6\u95f4
\n2015\u5e744\u6708
\n\u4f5c\u8005
\n\u5f20\u5f66\u9f99 (ylzhang@fortinet.com)
\n\u53d7\u5f71\u54cd\u7684\u7248\u672c
\nFortiOS (4.3.X, 5.0.X, 5.2.X)
\n\u72b6\u6001
\n\u8349\u7a3f
\n1. \u7b80\u4ecb
\n1.1 SSL 3.0 poodle\u6f0f\u6d1e\u4ecb\u7ecd
\n2014\u5e7410\u670815\u65e5\uff0cGoogle\u7814\u7a76\u4eba\u5458\u516c\u5e03SSL 3.0\u534f\u8bae\u5b58\u5728\u4e00\u4e2a\u975e\u5e38\u4e25\u91cd\u7684\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u53ef\u88ab\u9ed1\u5ba2\u7528\u4e8e\u622a\u53d6\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u8fdb\u884c\u4f20\u8f93\u7684\u52a0\u5bc6\u6570\u636e\uff0c\u5982\u7f51\u94f6\u8d26\u53f7\u3001\u90ae\u7bb1\u8d26\u53f7\u3001\u4e2a\u4eba\u9690\u79c1\u7b49\u7b49\u3002SSL 3.0\u7684\u6f0f\u6d1e\u5141\u8bb8\u653b\u51fb\u8005\u53d1\u8d77\u964d\u7ea7\u653b\u51fb\uff0c\u5373\u6b3a\u9a97\u6d4f\u89c8\u5668\u8bf4\u201c\u670d\u52a1\u5668\u4e0d\u652f\u6301\u66f4\u5b89\u5168\u7684\u5b89\u5168\u4f20\u8f93\u5c42(TLS)\u534f\u8bae\u201d\uff0c\u7136\u540e\u5f3a\u5236\u5176\u8f6c\u5411\u4f7f\u7528SSL 3.0\uff0c\u5728\u5f3a\u5236\u6d4f\u89c8\u5668\u91c7\u7528SSL 3.0\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u901a\u8baf\u4e4b\u540e\uff0c\u9ed1\u5ba2\u5c31\u53ef\u4ee5\u5229\u7528\u4e2d\u95f4\u4eba\u653b\u51fb\u6765\u89e3\u5bc6HTTPs\u7684cookies\uff0cGoogle\u5c06\u5176\u79f0\u4e4b\u4e3aPOODLE\u653b\u51fb\uff0c\u82e5\u53d7\u5230POODLE \u653b\u51fb\uff0c\u6240\u6709\u5728\u7f51\u7edc\u4e0a\u4f20\u8f93\u7684\u6570\u636e\u5c06\u4e0d\u518d\u52a0\u5bc6\u3002\u76ee\u524d\u5df2\u88abTLS 1.0\uff0cTLS 1.1\uff0cTLS 1.2\u66ff\u4ee3\uff0c\u56e0\u4e3a\u517c\u5bb9\u6027\u539f\u56e0\uff0c\u5927\u591a\u6570\u7684TLS\u5b9e\u73b0\u4f9d\u7136\u517c\u5bb9SSL3.0\u3002
\n1.2 SSL 3.0 poodle\u653b\u51fb\u539f\u7406
\n\u4e3a\u4e86\u901a\u7528\u6027\u7684\u8003\u8651\uff0c\u76ee\u524d\u591a\u6570\u6d4f\u89c8\u5668\u7248\u672c\u90fd\u652f\u6301SSL3.0\uff0cTLS\u534f\u8bae\u7684\u63e1\u624b\u9636\u6bb5\u5305\u542b\u4e86\u7248\u672c\u534f\u5546\u6b65\u9aa4\uff0c\u4e00\u822c\u6765\u8bf4\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u7684\u6700\u65b0\u7684\u534f\u8bae\u7248\u672c\u5c06\u4f1a\u88ab\u4f7f\u7528\u3002\u5176\u5728\u4e0e\u670d\u52a1\u5668\u7aef\u7684\u63e1\u624b\u9636\u6bb5\u8fdb\u884c\u7248\u672c\u534f\u5546\u7684\u65f6\uff0c\u9996\u5148\u63d0\u4f9b\u5176\u6240\u652f\u6301\u534f\u8bae\u7684\u6700\u65b0\u7248\u672c\uff0c\u82e5\u8be5\u63e1\u624b\u5931\u8d25\uff0c\u5219\u5c1d\u8bd5\u4ee5\u8f83\u65e7\u7684\u534f\u8bae\u7248\u672c\u534f\u5546\u3002\u80fd\u591f\u5b9e\u65bd\u4e2d\u95f4\u4eba \u653b\u51fb\u7684\u653b\u51fb\u8005\u901a\u8fc7\u4f7f\u53d7\u5f71\u54cd\u7248\u672c\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u5668\u7aef\u4f7f\u7528\u8f83\u65b0\u534f\u8bae\u7684\u534f\u5546\u7684\u8fde\u63a5\u5931\u8d25\uff0c\u53ef\u4ee5\u6210\u529f\u5b9e\u73b0\u964d\u7ea7\u653b\u51fb\uff0c\u4ece\u800c\u4f7f\u5f97\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u7aef\u4f7f\u7528\u4e0d\u5b89\u5168\u7684SSL3.0 \u8fdb\u884c\u901a\u4fe1\uff0c\u6b64\u65f6\uff0c\u7531\u4e8eSSL 3.0\u4f7f\u7528\u7684CBC\u5757\u52a0\u5bc6\u7684\u5b9e\u73b0\u5b58\u5728\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u6210\u529f\u7834\u89e3SSL\u8fde\u63a5\u7684\u52a0\u5bc6\u4fe1\u606f\uff0c\u6bd4\u5982\u83b7\u53d6\u7528\u6237cookie\u6570\u636e\u3002\u8fd9\u79cd\u653b\u51fb\u88ab\u79f0\u4e3aPOODL\u653b\u51fb (Padding Oracle On Downgraded Legacy Encryption)\u3002 \u6b64\u6f0f\u6d1e\u5f71\u54cd\u7edd\u5927\u591a\u6570SSL\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\uff0c\u5f71\u54cd\u8303\u56f4\u5e7f\u6cdb\u3002\u4f46\u653b\u51fb\u8005\u5982\u8981\u5229\u7528\u6210\u529f\uff0c\u9700\u8981\u80fd\u591f\u63a7\u5236\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u6570\u636e(\u6267\u884c\u4e2d\u95f4\u4eba\u653b\u51fb)\u3002\u901a\u5e38\u7528\u6237\u7684\u6d4f\u89c8\u5668\u90fd\u4f7f\u7528\u65b0\u7248\u672c\u7684\u5b89\u5168\u534f\u8bae\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u8fde\u63a5\uff0c\u4e3a\u4e86\u4fdd\u6301\u517c\u5bb9\u6027\uff0c\u5f53\u6d4f\u89c8\u5668\u5b89\u5168\u534f\u8bae\u8fde\u63a5\u5931\u8d25\u7684\u65f6\u5019\uff0c \u5c31\u4f1a\u8f6c\u800c\u5c1d\u8bd5\u8001\u7248\u672c\u7684\u5b89\u5168\u534f\u8bae\u8fdb\u884c\u8fde\u63a5\uff0c\u5176\u4e2d\u5c31\u5305\u62ecSSL 3.0\u3002Poodle\u653b\u51fb\u7684\u539f\u7406\uff0c\u5c31\u662f\u9ed1\u5ba2\u6545\u610f\u5236\u9020\u5b89\u5168\u534f\u8bae\u8fde\u63a5\u5931\u8d25\u7684\u60c5\u51b5\uff0c\u89e6\u53d1\u6d4f\u89c8\u5668\u7684\u964d\u7ea7\u4f7f\u7528 SSL 3.0\uff0c\u7136\u540e\u4f7f\u7528\u7279\u6b8a\u7684\u624b\u6bb5\uff0c\u4ece SSL 3.0 \u8986\u76d6\u7684\u5b89\u5168\u8fde\u63a5\u4e0b\u63d0\u53d6\u5230\u4e00\u5b9a\u5b57\u8282\u957f\u5ea6\u7684\u9690\u79c1\u4fe1\u606f\u3002
\n1.3 SSL\u534f\u8bae\u8981\u70b9
\nSSL\u534f\u8bae\u7531\u7f8e\u56fd NetScape\u516c\u53f8\u5f00\u53d1\u7684\uff0c 1996\u5e74\u53d1\u5e03\u4e86V3.0\u7248\u672c\u3002SSL 3.0 \u5df2\u7ecf\u5b58\u5728 15 \u5e74\u4e4b\u4e45\uff0c\u76ee\u524d\u7edd\u5927\u591a\u6570\u6d4f\u89c8\u5668\u90fd\u652f\u6301\u8be5\u7248\u672c\u3002SSL3.0\u662f\u5df2\u8fc7\u65f6\u4e14\u4e0d\u5b89\u5168
\n\u7684\u534f\u8bae\uff0cSSL(Secure Sockets Layer \u5b89\u5168\u5957\u63a5\u5c42)\u662f\u4e00\u79cd\u57fa\u4e8eWeb\u5e94\u7528\u7684\u5b89\u5168\u901a\u4fe1\u534f\u8bae\u3002 SSL\u4ecb\u4e8eTCP\u534f\u8bae\u548c\u5e94\u7528\u5c42\u534f\u8bae\u4e4b\u95f4\uff0c\u4e3b\u8981\u4f5c\u7528\u5c31\u662f\u5c06HTTP\u3001FTP\u7b49\u5e94\u7528\u5c42\u7684\u6570\u636e\u8fdb\u884c\u52a0\u5bc6\u7136\u540e\u4f9d\u6258\u53ef\u9760\u7684TCP\u534f\u8bae\u5728\u4e92\u8054\u7f51\u4e0a\u4f20\u8f93\u5230\u76ee\u7684\u5730\uff0c\u5176\u4e2d\u6700\u5178\u578b\u7684\u5e94\u7528\u5c31\u662fhttps\u3002
\n1.4 SSL\u63d0\u4f9b3\u4e2a\u57fa\u672c\u7684\u5b89\u5168\u670d\u52a1\uff1a
\n1\uff09\u8eab\u4efd\u5408\u6cd5\u6027\uff1a\u6570\u636e\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u8981\u786e\u8ba4\u5f7c\u6b64\u8eab\u4efd\uff0c\u8981\u786e\u4fdd\u5404\u81ea\u7684\u8eab\u4efd\u4e0d\u4f1a\u88ab\u5192\u5145\u3002
\n2\uff09\u6570\u636e\u673a\u5bc6\u6027\uff1a\u6240\u6709\u4f20\u8f93\u7684\u6570\u636e\u90fd\u8fdb\u884c\u52a0\u5bc6\uff0c\u5e76\u4e14\u8981\u786e\u4fdd\u5373\u4f7f\u6570\u636e\u88ab\u622a\u83b7\u4e5f\u65e0\u6cd5\u7834\u89e3\u3002
\n3\uff09\u6570\u636e\u5b8c\u6574\u6027\uff1a\u786e\u4fdd\u6536\u5230\u7684\u6570\u636e\u4e0e\u53d1\u9001\u65b9\u53d1\u51fa\u7684\u6570\u636e\u4e00\u81f4\uff0c\u6ca1\u6709\u88ab\u7be1\u6539\u3002
\n1.5 SSL\u534f\u8bae\u4e3b\u8981\u91c7\u7528\u7684\u6570\u636e\u52a0\u5bc6\u7b97\u6cd5\uff1a
\n1\uff09\u975e\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\uff1a\u6570\u636e\u52a0\u5bc6\u548c\u89e3\u5bc6\u4f7f\u7528\u4e0d\u540c\u7684\u5bc6\u94a5\uff0c\u5982RSA\u516c\u94a5\u52a0\u5bc6\u7b97\u6cd5\u3002\u4f18\u70b9\u662f\u5b89\u5168\u7ea7\u522b\u9ad8\uff0c\u5f88\u96be\u88ab\u7834\u89e3\uff1b\u7f3a\u70b9\u662f\u52a0\u5bc6\u89e3\u5bc6\u7684\u901f\u5ea6\u6162\uff0c\u56e0\u6b64\u53ea\u9002\u7528\u4e8e\u5c0f\u91cf\u6570\u636e\u7684\u52a0\u5bc6\u3002SSL\u534f\u8bae\u91c7\u7528\u975e\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u5b9e\u73b0\u6570\u5b57\u7b7e\u540d\uff0c\u9a8c\u8bc1\u6570\u636e\u53d1\u9001\u65b9\uff08\u6216\u63a5\u6536\u65b9\uff09\u7684\u8eab\u4efd\uff0c\u540c\u65f6\u4e5f\u7528\u975e\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u4ea4\u6362\u5bc6\u94a5\uff08\u7528\u4e8e\u6570\u636e\u52a0\u5bc6\u7684\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u7684\u5bc6\u94a5\uff0c\u4ee5\u53ca\u7528\u4e8e\u6570\u636e\u5b8c\u6574\u6027\u9a8c\u8bc1\u7684MAC\u7b97\u6cd5\uff09\u3002
\n2\uff09\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\uff1a\u6570\u636e\u52a0\u5bc6\u548c\u89e3\u5bc6\u4f7f\u7528\u540c\u4e00\u4e2a\u5bc6\u94a5\uff0c\u5982DES\u30013DES\u3001RC4\u7b49\u90fd\u662f\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u3002\u4f18\u70b9\u662f\u52a0\u89e3\u5bc6\u901f\u5ea6\u5feb\uff0c\u9002\u7528\u4e8e\u5927\u6570\u636e\u91cf\u7684\u52a0\u5bc6\uff0c\u4f46\u5b89\u5168\u6027\u8f83\u5dee\u3002SSL\u534f\u8bae\u91c7\u7528\u5bf9\u79f0\u52a0\u5bc6\u7b97\u6cd5\u5bf9\u4f20\u8f93\u7684\u6570\u636e\u8fdb\u884c\u52a0\u5bc6\u3002
\n3\uff09MAC\u7b97\u6cd5\uff1aMessage Authentication Codes\uff0c\u5373\u6d88\u606f\u8ba4\u8bc1\u7801\u7b97\u6cd5\uff0cMAC\u542b\u6709\u5bc6\u94a5\u6563\u5217\u51fd\u6570\u7b97\u6cd5\uff0c\u517c\u5bb9\u4e86MD\u548cSHA\u7b97\u6cd5\u7684\u7279\u6027\uff0c\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\u52a0\u5165\u4e86\u5bc6\u94a5\u3002SSL\u534f\u8bae\u91c7\u7528MAC\u7b97\u6cd5\u6765\u68c0\u9a8c\u6d88\u606f\u7684\u5b8c\u6574\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"