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"iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References"

Author

"Google Security Research"

Platform

multiple

Release date

2019-07-30

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When deserializing a class with initWithCoder, subclasses of that class can also be deserialized so long as they do not override initWithCoder and implement all methods that require a concrete implementation.

_PFArray is such a subclass of NSArray. When a _PFArray is deserialized, it is deserialized with [NSArray initWithCoder:], which eventually calls [_PFArray initWithObjects:count:]. This method initializes the array with the objects provided by the NSKeyedUnarchiver, but does not retain references to these objects, so when the NSKeyedUnarchiver is released, the objects in the array will also be released, even though the user of the deserialized objects could still be using them.

This issue can be reached remotely via iMessage and crash Springboard with no user interaction.

To reproduce the issue with the files in pfarray.zip:

1) install frida (pip3 install frida)
2) open sendMessage.py, and replace the sample receiver with the phone number or email of the target device
3) in injectMessage.js replace the marker "PATH" with the path of the obj file
4) in the local directory, run:

python3 sendMessage.py


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/47192.zip
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2019-08-15 "Microsoft Windows Text Services Framework MSCTF - Multiple Vulnerabilities" local windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Double Free due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - free() of Uninitialized Pointer due to Malformed JBIG2Globals Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Memory Corruption due to Malformed TTF Font" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow in CoolType.dll" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed Font Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Static Buffer Overflow due to Malformed Font Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow While Processing Malformed PDF" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Use-After-Free due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Out-of-Bounds read due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in FixSbitSubTableFormat1" dos windows "Google Security Research"
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2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in ReadTableIntoStructure" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in FixSbitSubTables" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Double Free in MergeFormat12Cmap / MakeFormat12MergedGlyphList" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in GetGlyphIdx" dos windows "Google Security Research"
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2019-08-15 "Adobe Acrobat CoolType (AFDKO) - Call from Uninitialized Memory due to Empty FDArray in Type 1 Fonts" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat CoolType (AFDKO) - Memory Corruption in the Handling of Type 1 Font load/store Operators" dos windows "Google Security Research"
2019-08-15 "NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String" dos multiple "Google Security Research"
2019-08-12 "WebKit - UXSS via XSLT and Nested Document Replacements" dos multiple "Google Security Research"
2019-08-12 "Linux - Use-After-Free Reads in show_numa_stats()" dos linux "Google Security Research"
2019-08-07 "Google Chrome 74.0.3729.0 / 76.0.3789.0 - Heap Use-After-Free in blink::PresentationAvailabilityState::UpdateAvailability" dos multiple "Google Security Research"
2019-08-05 "macOS iMessage - Heap Overflow when Deserializing" dos macos "Google Security Research"
2019-07-30 "iMessage - NSKeyedUnarchiver Deserialization Allows file Backed NSData Objects" dos multiple "Google Security Research"
2019-07-30 "iMessage - Memory Corruption when Decoding NSKnownKeysDictionary1" dos multiple "Google Security Research"
2019-07-30 "iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47192/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47192/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47192/41570/imessage-nsarray-deserialization-can-invoke-subclass-that-does-not-retain-references/download/", "exploit_id": "47192", "exploit_description": "\"iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References\"", "exploit_date": "2019-07-30", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "multiple", "exploit_port": null}
                    

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