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690 B
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15 lines
No EOL
690 B
Text
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1170
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Via NSUnarchiver we can read NSBuiltinCharacterSet with a controlled serialized state.
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It reads a controlled int using decodeValueOfObjCType:"i" then either passes it to
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CFCharacterSetGetPredefined or uses it directly to manipulate __NSBuiltinSetTable.
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Neither path has any bounds checking and the index is used to maniupulate c arrays of pointers.
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Attached python script will generate a serialized NSBuiltinCharacterSet with a value of 42
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for the character set identifier.
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tested on MacOS 10.12.3 (16D32)
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Proof of Concept:
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42050.zip |