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Apple iOS / macOS - NSUnarchiver Heap Corruption Due to Lack of Bounds Checking in [NSBuiltinCharact
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1170 Via NSUnarchiver we can read NSBuiltinCharacterSet with a controlled serialized state. It reads a controlled int using decodeValueOfObjCType:"i" then either passes it to CFCharacterSetGetPredefined or uses it directly to manipulate __NSBuiltinSetTable. Neither path has any bounds checking and the index is used to maniupulate c arrays of pointers. Attached python script will generate a serialized NSBuiltinCharacterSet with a value of 42 for the character set identifier. tested on MacOS 10.12.3 (16D32) Proof of Concept: https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/42050.zip # 0day.today [2024-11-15] #