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IndexOutOfRange exception

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
52/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
csharp
Ambito
reverse-engineering

Direzione di ricerca

Reproduce the failure with ILSpyCmd 11.1.0.9782, using the packed sample and the reported -il -o ./disasm command. Start in ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs at WriteParameters line 1147 and DisassemblePropertyHeaderInternal line 1456; done means the affected child CIL components no longer terminate with either reported exception.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Bug Obfuscated
Steps to reproduce

I've encountered an error using ILSpyCmd to disassemble CIL components of this packed sample from VirusTotal: https://www.virustotal.com/gui/file/ee38d2feb95a01c192ef7b60631b78e6feab9360a0af2fc2d0518c68a63686c6/details

I've unpacked the exe, deobfuscated the CIL components with DE4Dot, and tried to disassemble them with ILSpyCmd using ilspycmd -il -o ./disasm path/to/exec.

Error message shown
System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Immutable.ImmutableArray`1.get_Item(Int32 index)
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.WriteParameters(MetadataReader metadata, IEnumerable`1 parameters, MethodSignature`1 signature) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 1147
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassembleMethodHeaderInternal(MetadataFile module, MethodDefinitionHandle handle, MetadataGenericContext genericContext) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 305
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassembleMethod(MetadataFile module, MethodDefinitionHandle handle) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 159
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassembleType(MetadataFile module, TypeDefinitionHandle type) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 1688
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.WriteModuleContents(MetadataFile module) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 2203
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.ShowIL(String assemblyFileName, TextWriter output) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 682
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.<OnExecuteAsync>g__PerformPerFileAction|114_0(String fileName, <>c__DisplayClass114_0&, <>c__DisplayClass114_1&) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 368
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.OnExecuteAsync(CommandLineApplication app) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 314

or

System.BadImageFormatException: Read out of bounds.
   at System.Reflection.Throw.OutOfBounds()
   at System.Reflection.Metadata.BlobReader.ReadSignatureHeader()
   at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeMethodSignature(BlobReader& blobReader)
   at System.Reflection.Metadata.PropertyDefinition.DecodeSignature[TType,TGenericContext](ISignatureTypeProvider`2 provider, TGenericContext genericContext)
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassemblePropertyHeaderInternal(MetadataFile module, PropertyDefinitionHandle handle, MetadataReader metadata, PropertyDefinition propertyDefinition) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 1456
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassembleProperty(MetadataFile module, PropertyDefinitionHandle property) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 1428
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.DisassembleType(MetadataFile module, TypeDefinitionHandle type) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 1711
   at ICSharpCode.Decompiler.Disassembler.ReflectionDisassembler.WriteModuleContents(MetadataFile module) in /_/ICSharpCode.Decompiler/Disassembler/ReflectionDisassembler.cs:line 2203
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.ShowIL(String assemblyFileName, TextWriter output) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 682
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.<OnExecuteAsync>g__PerformPerFileAction|114_0(String fileName, <>c__DisplayClass114_0&, <>c__DisplayClass114_1&) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 368
   at ICSharpCode.ILSpyCmd.ILSpyCmdProgram.OnExecuteAsync(CommandLineApplication app) in D:\a\ILSpy\ILSpy\ICSharpCode.ILSpyCmd\IlspyCmdProgram.cs:line 314

depending on which child CIL component of the packed exe I'm trying to analyze.

Details

I am using ILSpyCmd version 11.1.0.9782.

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