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"NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String"

Author

"Google Security Research"

Platform

multiple

Release date

2019-08-15

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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://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/47257.zip
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47257/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47257/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47257/41626/nskeyedunarchiver-info-leak-in-decoding-sgbigutf8string/download/", "exploit_id": "47257", "exploit_description": "\"NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String\"", "exploit_date": "2019-08-15", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "multiple", "exploit_port": null}
                    

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