Security researchers working with Google’s Project Zero have discovered a series of five vulnerabilities in Apple’s iOS platform, some of which can be exploited without user interaction.
Four of the vulnerabilities were addressed with the release of iOS 12.4 on July 22, but the patch included in that platform release does not resolve the fifth security bug, one of the researchers who discovered the issue reveals.
Tracked as CVE-2019-8646, the first of these vulnerabilities “allows an attacker to read files off a remote device with no user interaction, as user mobile with no sandbox,” Google Project Zero security researcher Natalie Silvanovich explains.
The issue, the researcher notes, is that the class _NSDataFileBackedFuture can be deserialized even if secure encoding is enabled, which could lead to access to local files or to an NSData object being created with a length that is different than the length of its byte array. Apple has addressed the vulnerability with improved input validation.
Tracked as CVE-2019-8660, the second vulnerability is a memory corruption issue that can be exploited without user interaction to cause unexpected application termination or arbitrary code execution. The flaw is triggered when decoding an object of class NSKnownKeysDictionary1.
“This class decodes an object of type NSKnownKeysMappingStrategy1, which decodes a length member which is supposed to represent the length of the keys of the dictionary. However, this member is decoded before the keys are decoded, so if a key is an instance of NSKnownKeysDictionary1, which also uses this instance of NSKnownKeysMappingStrategy1, the mapping strat ..
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