NSKeyedUnarchiver – Info Leak in Decoding SGBigUTF8String

• Exploit Database
• 26 阅读

• 作者： Google Security Research
  日期： 2019-08-15
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/47257/

• There is an info leak when decoding the SGBigUTF8String class using [SGBigUTF8String initWithCoder:]. This class initializes the string using [SGBigUTF8String initWithUTF8DataNullTerminated:] even though there is no guarantee the bytes provided to the decoder are null terminated. It should use [SGBigUTF8String initWithUTF8Data:] instead.
  
  While this class is included in iMessage, it is more likely that this bug could be useful in local attacks.
  
  To reproduce this issue:
  
  1) Compile decodeleak.m
  
  clang -o decodeleak -g decodeleak.m -fobjc-arc -framework CoreSuggestionsInternals -F/System/Library/PrivateFrameworks
  
  2) Run:
  
  ./decodeleaks obj
  
  leaked memory will be printed to the screen.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47257.zip