NSKeyedUnarchiver – Info Leak in Decoding SGBigUTF8String
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 |