19 lines
No EOL
804 B
Text
19 lines
No EOL
804 B
Text
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.
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While this class is included in iMessage, it is more likely that this bug could be useful in local attacks.
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To reproduce this issue:
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1) Compile decodeleak.m
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clang -o decodeleak -g decodeleak.m -fobjc-arc -framework CoreSuggestionsInternals -F/System/Library/PrivateFrameworks
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2) Run:
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./decodeleaks obj
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leaked memory will be printed to the screen.
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Proof of Concept:
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47257.zip |