{"id":10404,"date":"2014-11-13T14:11:54","date_gmt":"2014-11-13T06:11:54","guid":{"rendered":"https:\/\/blog.trendmicro.com.tw\/?p=10404"},"modified":"2014-11-12T17:32:49","modified_gmt":"2014-11-12T09:32:49","slug":"cve-2014-4115%e5%88%86%e6%9e%90%ef%bc%9a%e6%83%a1%e6%84%8fusb-%e7%a3%81%e7%a2%9f%e5%8f%af%e8%83%bd%e5%b0%8e%e8%87%b4%e6%95%b4%e5%80%8b%e7%b3%bb%e7%b5%b1%e8%a2%ab%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/blog.trendmicro.com.tw\/?p=10404","title":{"rendered":"CVE-2014-4115\u5206\u6790\uff1a\u60e1\u610fUSB \u78c1\u789f\u53ef\u80fd\u5c0e\u81f4\u6574\u500b\u7cfb\u7d71\u88ab\u63a7\u5236"},"content":{"rendered":"

2014\u5e7410\u6708\u7684\u9031\u4e8c\u4fee\u88dc\u7a0b\u5f0f\u65e5\u7684\u5176\u4e2d\u4e00\u9805\u662fMS14-063<\/a>\uff0c\u7528\u4f86\u89e3\u6c7aFAT32\u78c1\u789f\u5206\u5272\u5340\u9a45\u52d5\u7a0b\u5f0f\u4e2d\u7684\u6f0f\u6d1e\uff0c\u6b64\u6f0f\u6d1e\u8b93\u653b\u64ca\u8005\u53ef\u4ee5\u53d6\u5f97\u53d7\u5f71\u97ff\u7cfb\u7d71\u4e0a\u7684\u7ba1\u7406\u8005\u6b0a\u9650\uff0c\u53ea\u9700\u8981\u4e00\u500b\u5177\u5099\u7279\u88fd\u6a94\u6848\u7cfb\u7d71\u7684USB\u78c1\u789f\u3002\u9019\u500b\u6f0f\u6d1e\u4e5f\u88ab\u7de8\u865f\u70baCVE-2014-4115<\/a>\u3002<\/p>\n

\"vulnerability2\"<\/a><\/p>\n

\u70ba\u4ec0\u9ebc\u6b64\u6f0f\u6d1e\u4e26\u4e0d\u5c0b\u5e38\uff1f<\/em><\/strong><\/p>\n

\u6211\u5011\u7279\u5225\u6ce8\u610f\u6a94\u6848\u7cfb\u7d71\u9a45\u52d5\u7a0b\u5f0f\uff0c\u56e0\u70ba\u5b83\u5011\u53ef\u4ee5\u88ab\u7528\u4f86\u900f\u904eUSB\u78c1\u789f\u6a5f\u4f86\u653b\u64ca\u7cfb\u7d71\u3002\u60f3\u60f3\u770b\u4e4b\u524d\u7684Stuxnet\u6f0f\u6d1e\uff1a\u5b83\u900f\u904eWindows\u6377\u5f91\u6f0f\u6d1e\u4f86\u6563\u64ad\uff0c\u80fd\u5920\u8f15\u6613\u5730\u57f7\u884cWindows shell\u7a0b\u5f0f\u78bc\uff1b\u518d\u5229\u7528\u7b2c\u4e8c\u500b\u6f0f\u6d1e\u4f86\u53d6\u5f97\u7ba1\u7406\u8005\u6b0a\u9650\u3002\u6a94\u6848\u7cfb\u7d71\u9a45\u52d5\u7a0b\u5f0f\u6f0f\u6d1e\u53ef\u4ee5\u4e00\u6b21\u5c31\u9054\u5230\u539f\u672c\u9700\u8981\u5169\u6b65\u9a5f\u7684\u6548\u679c\u3002<\/p>\n

CVE-2014-4115\u5b58\u5728\u65bcWindows Vista\u3001Server 2003\u3001Server 2008\u7684\u6a94\u6848\u7cfb\u7d71\u9a45\u52d5\u7a0b\u5f0f\uff08FASTFAT.SYS<\/em>\uff09\u3002\u6b64\u9a45\u52d5\u7a0b\u5f0f\u8ca0\u8cac\u8655\u7406Fast FAT\u6a94\u6848\u7cfb\u7d71\uff08\u5982 FAT32\uff09\u3002\u7576\u8655\u7406FAT32\u683c\u5f0f\u78c1\u789f\u4e2d\u5e36\u6709\u7279\u6b8aBIOS\u53c3\u6578\u5340\u584a\uff08BPB\uff09\u7684\u958b\u6a5f\u78c1\u5340\u6642\uff0c\u5c31\u53ef\u80fd\u89f8\u767c\u6b64\u6f0f\u6d1e\u3002<\/p>\n

FAT32\u4eca\u65e5\u4ecd\u88ab\u666e\u904d\u5730\u7528\u5728USB\u96a8\u8eab\u789f\u4e0a\u3002\u6b63\u56e0\u5982\u6b64\uff0c\u91dd\u5c0d\u6027\u653b\u64ca\u53ef\u4ee5\u5229\u7528\u6b64\u6f0f\u6d1e\u3002\u5047\u8a2d\u4e00\u500b\u7279\u88fd\u7684USB\u96a8\u8eab\u789f\u4ee5\u67d0\u7a2e\u65b9\u5f0f\u63d2\u5165\u9ad8\u968e\u4e3b\u7ba1\u7684\u7b46\u8a18\u578b\u96fb\u8166\u6216\u516c\u53f8\u5167\u90e8\u7db2\u8def\u7684\u96fb\u8166\u3002\u9019\u4e9b\u7cfb\u7d71\u5c31\u6703\u88ab\u5916\u90e8\u60e1\u610f\u4efd\u5b50\u6240\u63a7\u5236\uff0c\u5c31\u6709\u53ef\u80fd\u88ab\u7528\u4f86\u9032\u884c\u91dd\u5c0d\u6027\u653b\u64ca\u3002\u00a0\u7cfb\u7d71\u7ba1\u5a92\u9ad4\u7684\u653f\u7b56\u3002<\/p>\n

\u7cfb\u7d71\u7ba1\u7406\u54e1\u53ca\u6642\u9032\u884c\u4fee\u88dc\u53ef\u4ee5\u6e1b\u5c11\u6210\u70ba\u653b\u64ca\u53d7\u5bb3\u8005\u7684\u98a8\u96aa\u3002\u4f01\u696d\u7cfb\u7d71\u7ba1\u7406\u54e1\u4e5f\u8a72\u91cd\u65b0\u8003\u616e\u5728\u516c\u53f8\u5167\u90e8\u7db2\u8def\u4f7f\u7528USB\u5a92\u9ad4\u7684\u653f\u7b56\u3002<\/p>\n

\u9019\u500b\u6f0f\u6d1e\u662f\u4ec0\u9ebc\uff0c\u51fa\u73fe\u5728\u54ea\u88e1\uff1f<\/em><\/strong><\/p>\n

\u5982\u524d\u6240\u8ff0\uff0c\u6b64\u6f0f\u6d1e\u51fa\u73fe\u5728FASTFAT.<\/em>SYS<\/em>\u3002\u6bd4\u8f03\u904e\u6709\u6f0f\u6d1e\u7684\u7248\u672c\u548c\u4fee\u88dc\u904e\u7684\u7248\u672c\uff0c\u552f\u4e00\u5340\u5225\u5728\u65bc\uff1a\u51fd\u6578 FatCommonWrite()<\/em>\u3002<\/p>\n

\"\"
\u5716 1\u3001\u539f\u59cb\u548c\u4fee\u88dc\u904eFASTFAT.SYS\u7684\u5dee\u7570<\/figcaption><\/figure>\n

 <\/p>\n

<\/p>\n

\u7576\u547c\u53eb\u51fd\u6578 ExAllocatePoolWithTag<\/em>\u6642\uff0c\u7b2c\u4e8c\u500b\u53c3\u6578\uff08NumberOfBytes<\/em>\uff09\u5728\u4fee\u88dc\u7248\u672c\u88ab\u4e58\u4ee50x18\u3002<\/p>\n

\u51fd\u6578ExAllocatePoolWithTag()\u7684\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n

PVOID ExAllocatePoolWithTag(<\/p>\n

_In_\u00a0 POOL_TYPE PoolType,<\/p>\n

_In_\u00a0 SIZE_T NumberOfBytes<\/strong>,<\/p>\n

_In_\u00a0 ULONG Tag<\/p>\n

);<\/p>\n

 <\/p>\n

\u6f0f\u6d1e\u672c\u8eab\u5f88\u7c21\u55ae\u3002\u958b\u767c\u8005\u932f\u8aa4\u8a08\u7b97\u6240\u9700\u5206\u914d\u7684\u8a18\u61b6\u9ad4\u5927\u5c0f\uff1a\u5fd8\u4e86\u5c07\u7d50\u69cb\u6578\u91cf\u4e58\u4ee5\u55ae\u4e00\u6307\u4ee4\u5927\u5c0f\u3002\u9019\u53ef\u80fd\u5c0e\u81f4\u8d8a\u754c\u5806\u7a4d\u5beb\u5165\u932f\u8aa4\u3002<\/p>\n

 <\/p>\n

\u5229\u7528\u8a72\u6f0f\u6d1e\u7684\u865b\u64ec\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u63cf\u8ff0\u5982\u4e0b\uff1a<\/p>\n

 <\/p>\n

NTSTATUS FatCommonWrite (<\/p>\n

IN PIRP_CONTEXT IrpContext,<\/p>\n

IN PIRP Irp<\/p>\n

)<\/p>\n

 <\/p>\n

{<\/p>\n

\u2026\u2026<\/p>\n

if (TypeOfOpen == VirtualVolumeFile)<\/p>\n

{<\/p>\n

\u2026.<\/p>\n

ULONG Fat;<\/p>\n

ULONG BytesPerFat;<\/p>\n

IO_RUN StackIoRuns[2];<\/p>\n

PIO_RUN IoRuns;<\/p>\n

BytesPerFat = FatBytesPerFat( &Vcb->Bpb );<\/p>\n

if ((ULONG)Vcb->Bpb.Fats > 2) {<\/p>\n

IoRuns = FsRtlAllocatePoolWithTag(<\/p>\n

PagedPool,<\/p>\n

(ULONG)(Vcb->Bpb.Fats), \/\/Actual vulnerability, missing \u00d7sizeof(IO_RUN)<\/p>\n

TAG_IO_RUNS );<\/p>\n

} else<\/p>\n

{<\/p>\n

IoRuns = StackIoRuns;}<\/p>\n

for (Fat = 0; Fat < (ULONG)Vcb->Bpb.Fats; Fat++)<\/p>\n

{<\/p>\n

IoRuns[Fat].Vbo = StartingDirtyVbo;<\/p>\n

IoRuns[Fat].Lbo = Fat * BytesPerFat + StartingDirtyVbo;<\/p>\n

IoRuns[Fat].Offset = StartingDirtyVbo \u2013 StartingVbo;<\/p>\n

IoRuns[Fat].ByteCount = WriteLength;<\/p>\n

}<\/p>\n

\u2026\u2026<\/p>\n

}<\/p>\n

\u2026\u2026<\/p>\n

}<\/p>\n

 <\/p>\n

\u986f\u7136\u5730\uff0c\u7576Bpb.Fats<\/em>\u70ba 3\u53ca\u4ee5\u4e0a\u6642\uff0cFsRtlAllocatePoolWithTag()<\/em>\u5206\u914d\u7d66IoRuns<\/em>\u7684\u8a18\u61b6\u9ad4\u6703\u5c0f\u65bc\u9810\u671f\u5927\u5c0f\u3002\u6240\u4ee5\u7576IoRuns\u518d\u5ea6\u88ab\u547c\u53eb\u6642\uff0c\u901a\u5e38\u6703\u5c0e\u81f4\u5d29\u6f70 \u2013 \u4f8b\u5982\uff0c\u7576\u5b83\u5728\u300cfor\u300d\u6558\u8ff0\u4e2d\u88ab\u521d\u59cb\u5316\u3002\u7136\u800c\uff0c\u99ed\u5ba2\u53ef\u4ee5\u7528\u5b83\u4f86\u6545\u610f\u7684\u8986\u5beb\u67d0\u4e9b\u6838\u5fc3\u5143\u4ef6\uff0c\u8a2d\u7f6e\u968e\u6bb5\u4f86\u57f7\u884c\u4efb\u610f\u7a0b\u5f0f\u78bc\u3002<\/p>\n

 <\/p>\n

\u89f8\u767c\u6b64\u6f0f\u6d1e<\/em><\/strong><\/p>\n

 <\/p>\n

\u4efb\u4f55\u4f7f\u7528VirtualVolumeFile\u6a94\u6848\u985e\u578b\u7684FAT32\u6a94\u6848\u5beb\u5165\u8acb\u6c42\u90fd\u53ef\u80fd\u6703\u89f8\u767cFatCommonWrite\uff0c\u95dc\u9375\u5728\u65bc\u5982\u4f55\u63a7\u5236Vcb-><\/em>Bpb.Fats<\/em>\u6eff\u8db3\u6f0f\u6d1e\u689d\u4ef6\uff08Vcb->Bpb.Fats > 2<\/em>\uff09\u3002<\/p>\n

 <\/p>\n

\u5728fastfat\u5be6\u4f5c\u4e2d\uff0cVcb<\/em>\uff08\u5377\u5340\u63a7\u5236\u5340\u6bb5\uff09\u8a18\u9304\u5c0d\u61c9\u4e8e\u6a94\u6848\u7cfb\u7d71\u6240\u639b\u8f09\u7684\u6bcf\u500b\u5377\u5340\u3002\u5728FatCommonWrite<\/em>\u4e2d\uff0cVcb<\/em>\u96a8\u8457FileObject<\/em>\u88ab\u521d\u59cb\u5316\uff08FAT32\u5377\u5340\u7684\u8a18\u61b6\u9ad4\u5448\u73fe\uff09\uff0c\u5c31\u5728\u6f0f\u6d1e\u4e4b\u524d\u3002<\/p>\n

 <\/p>\n

Vcb\u56de\u6eaf\u8a73\u60c5\u5982\u4e0b\uff1a<\/p>\n

 <\/p>\n

\"\"
\u57162\u3001Vcb\u56de\u6eaf<\/figcaption><\/figure>\n

 <\/p>\n

 <\/p>\n

_USBSTOR\u662f\u6211\u5011\u6e2c\u8a66USB\u78c1\u789f\u6a5f\u7684FAT32\u6a94\u6848\u7cfb\u7d71\u5377\u5340\u6a19\u7c64\u3002<\/p>\n

 <\/p>\n

\u4ec0\u9ebc\u662fBpb.Fats<\/em><\/strong>\uff1f<\/em><\/strong><\/p>\n

 <\/p>\n

\u901a\u5e38\u60c5\u6cc1\u4e0b\uff0cMBR\uff08\u4e3b\u958b\u6a5f\u8a18\u9304\uff09\u4f4d\u65bc\u78c1\u67f10\u3001\u78c1\u982d0\u3001\u78c1\u53401\uff0c\u800c\u7b2c\u4e00\u500bFAT32\u5377\u5340\u7684\u958b\u6a5f\u78c1\u5340\u4f4d\u65bc\u78c1\u67f10\u3001\u78c1\u982d1\u3001\u78c1\u5340 1\u3002<\/p>\n

 <\/p>\n

FAT\u5377\u5340\u7684\u7b2c\u4e00\u500b\u91cd\u8981\u8cc7\u6599\u7d50\u69cb\u7a31\u70baBPB\uff08BIOS\u53c3\u6578\u5340\u584a\uff09\uff0c\u5b83\u4f4d\u65bc\u4fdd\u7559\u5340\u57df\uff0c\u5377\u5340\u7684\u7b2c\u4e00\u500b\u78c1\u5340\uff08\u958b\u6a5f\u78c1\u5340\uff09\u3002<\/p>\n

 <\/p>\n

\"\"
\u57163\u3001BPB\u5728\u78c1\u789f\u4e2d<\/figcaption><\/figure>\n

 <\/p>\n

 <\/p>\n

BPB\u7d50\u69cb\u5b9a\u7fa9\u53ef\u4ee5\u5728Microsoft Windows Driver Kit\u4e2d\u627e\u5230\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

 <\/p>\n

typedef struct BIOS_PARAMETER_BLOCK {<\/p>\n

USHORT BytesPerSector;<\/p>\n

UCHAR\u00a0 SectorsPerCluster;<\/p>\n

USHORT ReservedSectors;<\/p>\n

UCHAR\u00a0 Fats; \/\/Number of FAT tables, default 2<\/p>\n

USHORT RootEntries;<\/p>\n

USHORT Sectors;<\/p>\n

UCHAR\u00a0 Media;<\/p>\n

USHORT SectorsPerFat;<\/p>\n

USHORT SectorsPerTrack;<\/p>\n

USHORT Heads;<\/p>\n

ULONG32\u00a0 HiddenSectors;<\/p>\n

ULONG32\u00a0 LargeSectors;<\/p>\n

ULONG32\u00a0 LargeSectorsPerFat;<\/p>\n

union {<\/p>\n

USHORT ExtendedFlags;<\/p>\n

struct {<\/p>\n

ULONG ActiveFat:4;<\/p>\n

ULONG Reserved0:3;<\/p>\n

ULONG MirrorDisabled:1;<\/p>\n

ULONG Reserved1:8;<\/p>\n

};<\/p>\n

};<\/p>\n

 <\/p>\n

USHORT FsVersion;<\/p>\n

ULONG32 RootDirFirstCluster;<\/p>\n

USHORT FsInfoSector;<\/p>\n

USHORT BackupBootSector;<\/p>\n

} BIOS_PARAMETER_BLOCK, *PBIOS_PARAMETER_BLOCK;<\/p>\n

 <\/p>\n

\u5982\u4f55\u63a7\u5236\u00a0<\/em><\/strong>Bpb.Fat<\/em><\/strong>\uff1f<\/em><\/strong><\/p>\n

 <\/p>\n

Bpb.Fat<\/em> \u4f4d\u5728\u78c1\u789f\u7684\u56fa\u5b9a\u4f4d\u5143\uff0c\u53ef\u4ee5\u76f4\u63a5\u7531\u78c1\u5340\u8b80\u5beb\u5de5\u5177\u9032\u884c\u4fee\u6539\u3002<\/p>\n

 <\/p>\n

\u5728\u6b64\u6e2c\u8a66\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e8c\u9032\u4f4d\u7de8\u8f2f\u5668FAT32\u7bc4\u672c\u4f86\u627e\u51faBpb<\/em>\uff08\u5373\u57164\u4e2d\u7684BPB_FAT32<\/em>\u7d50\u69cb\uff09\u7d50\u69cb\u548cFat<\/em>\u6b04\u4f4d\uff08\u57164\u4e2d\u7684NumberOfFats<\/em>\uff09\u3002<\/p>\n

 <\/p>\n

\"\"
\u57164\u3001BPB\u8cc7\u6599\u7d50\u69cb\u5167\u7684FATS<\/figcaption><\/figure>\n

 <\/p>\n

 <\/p>\n

\u6982\u5ff5\u8b49\u660e\u6e2c\u8a66\u5c0e\u81f4\u5d29\u6f70<\/em><\/strong><\/p>\n

 <\/p>\n

\u6211\u5011\u50c5\u53ea\u4fee\u6539FAT32 USB\u78c1\u789f\u6a5f\u7684BPB\u4f86\u9032\u884c\u6982\u5ff5\u8b49\u660e\u6e2c\u8a66\u3002\u6211\u5011\u4f7f\u7528\u78c1\u5340\u8b80\u5beb\u5de5\u5177\u5c07BPB_FAT32.NumberOfFATs<\/em>\u4fee\u6539\u6210\u5927\u65bc2\u7684\u6578\u5b57\u3002<\/p>\n

 <\/p>\n

\u7d93\u904e\u4ee5\u4e0b\u6b65\u9a5f\u5f88\u5feb\u5c31\u9020\u6210\u5d29\u6f70\uff1a<\/p>\n

 <\/p>\n

    \n
  1. \u5c07\u6b64USB\u78c1\u789f\u6a5f\u63d2\u5165\u4efb\u4e00\u53f0\u5177\u5099\u6709\u6f0f\u6d1eSYS\u7684\u96fb\u8166\u3002<\/li>\n
  2. \u5c0d\u6b64\u78c1\u789f\u6a5f\u57f7\u884c\u5beb\u5165\u52d5\u4f5c\uff08\u5373\u8907\u88fd\u6a94\u6848\u9032\u53bb\uff09\u3002<\/li>\n<\/ol>\n

     <\/p>\n

    \u7d50\u8ad6<\/em><\/strong><\/p>\n

     <\/p>\n

    \u9019\u500b\u6f0f\u6d1e\u5b58\u5728\u65bc\u820a\u7248\u672c\u7684Windows \u2013 Vista\u3001Server 2003\u548cServer 2008\u3002\u8f03\u65b0\u7684\u7248\u672c\u50cf\u662fWindows 7\u3001Windows 8\u3001Server 2008 R2\u548cServer 2012\u4e26\u4e0d\u6703\u53d7\u5230\u5f71\u97ff\u3002<\/p>\n

     <\/p>\n

    \u4fee\u88dc\u9019\u4e9b\u5e73\u53f0\u6f0f\u6d1e\u7684\u4fee\u88dc\u7a0b\u5f0f\u57fa\u672c\u4e0a\u8ddf\u8f03\u65b0\u7248\u672c\u4e0a\u7684\u4e00\u6a23\u3002\u6211\u5011\u5047\u8a2d\u6b64\u6f0f\u6d1e\u662f\u5728\u7de8\u5beb\u7a0b\u5f0f\u78bc\u6216\u5408\u4f75\u7a0b\u5f0f\u78bc\u6642\u7684\u4eba\u70ba\u932f\u8aa4\u3002\u9019\u8868\u793a\u53ef\u4ee5\u900f\u904e\u5c0dWindows 7\u548c\u5176\u4ed6\u5e73\u53f0FASTFAT.SYS<\/em>\u7684\u4e8c\u9032\u4f4d\u6bd4\u8f03\u4f86\u627e\u51fa\u66f4\u591a\u6f0f\u6d1e\u6216\u81ed\u87f2\u3002<\/p>\n

     <\/p>\n

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     <\/p>\n

    @\u539f\u6587\u51fa\u8655\uff1aCVE-2014-4115 Analysis: Malicious USB Disks Allow For Possible Whole System Control<\/a>\u4f5c\u8005\uff1aMoony Li\uff08\u5a01\u8105\u5206\u6790\u5e2b\uff09<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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