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NSKeyedUnarchiver SGBigUTF8String Decoding Information Leak

NSKeyedUnarchiver SGBigUTF8String Decoding Information Leak
Posted Aug 13, 2019
Authored by Google Security Research, natashenka

NSKeyedUnarchiver suffers from an information 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.

tags | exploit
advisories | CVE-2019-8663
MD5 | 5ebdb23ae44a72166cf9916fedd9770a
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