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"iOS 12.4 - Sandbox Escape due to Integer Overflow in mediaserverd"


Exploit author

"Google Security Research"


Exploit platform


Release date

Exploit published date


mediaserverd has various media parsing responsibilities; its reachable from various sandboxes
and is able to talk to interesting kernel drivers so is a valid target in an exploit chain.

One of the services it vends is, a fairly simple XPC service
which will parse audio files on behalf of clients and send them the raw bytes.

Files are opened via their ipod-library:// URL; for the purposes of this PoC you will need to
ensure there is at least one audio file in the iTunes library
(I've used one of my highschool band's MP3s, available on request, it's not that bad!)

The files are actually parsed by the AudioFileReadPacketData method; here's the prototype from the docs:

OSStatus AudioFileReadPacketData(AudioFileID inAudioFile,
                                 Boolean inUseCache,
                                 UInt32 *ioNumBytes,
                                 AudioStreamPacketDescription *outPacketDescriptions,
                                 SInt64 inStartingPacket,
                                 UInt32 *ioNumPackets,
                                 void *outBuffer);

The docs tell us the meaning of the ioNumBytes and outBuffer arguments:

On input, the size of the outBuffer parameter, in bytes. On output, the number of bytes actually read.

Memory that you allocate to hold the read packets. Determine an appropriate size by multiplying
the number of packets requested (in the ioNumPackets parameter) by the typical packet size
for the audio data in the file. For uncompressed audio formats, a packet is equal to a frame.

For the purposes of the bug this function has memcpy semantics; the value pointed to
by ioNumBytes will be considered the correct size of the output buffer;
AudioFileReadPacketData will be unable to verify that; it's up to the caller.

Looking at the code which calls this the values are derived from three values passed
in the 'read' xpc message:

numbytes (uint64), numpackets (uint64), startingPacket (int64)

Those values are truncated to 32 bits then passed through a few layers of function calls during which
various integer overflow occur when they're multiplied and added (there are no checks anywhere.)

You eventually end up in a curious allocation routine which is able to allocate three different types of
shared memory using either mach memory entries, posix shm or xpc_shmem. This service uses posix_shm,
the PoC should cause mediaserverd to shm_truncate and mmap a 0x4000 byte region,
then attempt to write significantly more bytes there.

In the debug_output.txt file you can see the debug output and crash log demonstrating that audio data has clearly
corrupted an object and caused a pointer to be overwritten with audio data.

Tested on iOS 12.4 (16G77) on iPod touch 6G

Proof of Concept:
Release DateTitleTypePlatformAuthor
2020-04-03"AIDA64 Engineer 6.20.5300 - 'Report File' filename Buffer Overflow (SEH)"localwindowsHodorsec
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2020-04-02"DiskBoss 7.7.14 - 'Input Directory' Local Buffer Overflow (PoC)"localwindows"Paras Bhatia"
2020-04-01"DiskBoss 7.7.14 - Denial of Service (PoC)"doswindows"Paras Bhatia"
2020-04-01"10Strike LANState 9.32 - 'Force Check' Buffer Overflow (SEH)"localwindowsHodorsec
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2020-03-31"Grandstream UCM6200 Series CTI Interface - 'user_password' SQL Injection"webappshardware"Jacob Baines"
2020-03-31"IBM TM1 / Planning Analytics - Unauthenticated Remote Code Execution (Metasploit)"remotemultipleMetasploit
2020-03-31"Grandstream UCM6200 Series WebSocket - 'user_password' SQL Injection"webappshardware"Jacob Baines"
2020-03-31"FlashFXP 4.2.0 Build 1730 - Denial of Service (PoC)"doswindows"Paras Bhatia"
2020-03-31"DLINK DWL-2600 - Authenticated Remote Command Injection (Metasploit)"remotehardwareMetasploit
2020-03-30"Zen Load Balancer 3.10.1 - Remote Code Execution"webappscgi"Cody Sixteen"
2020-03-30"Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Local Privilege Escalation"localwindows"Daniel García Gutiérrez"
2020-03-30"Multiple DrayTek Products - Pre-authentication Remote Root Code Execution"remotelinux0xsha
2020-03-30"10-Strike Network Inventory Explorer 9.03 - 'Read from File' Buffer Overflow (SEH)(ROP)"localwindowsHodorsec
2020-03-30"Joomla! com_fabrik 3.9.11 - Directory Traversal"webappsphpqw3rTyTy
2020-03-30"Odin Secure FTP Expert 7.6.3 - 'Site Info' Denial of Service (PoC)"doswindows"Ivan Marmolejo"
2020-03-27"Jinfornet Jreport 15.6 - Unauthenticated Directory Traversal"webappsjavahongphukt
2020-03-27"rConfig 3.9.4 - 'searchField' Unauthenticated Root Remote Code Execution"webappsphpvikingfr
2020-03-27"Easy RM to MP3 Converter - 'Input' Local Buffer Overflow (SEH)"localwindows"Felipe Winsnes"
2020-03-27"ECK Hotel 1.0 - Cross-Site Request Forgery (Add Admin)"webappsphp"Mustafa Emre Gül"
2020-03-27"Everest 5.50.2100 - 'Open File' Denial of Service (PoC)"doswindows"Ivan Marmolejo"
2020-03-26"TP-Link Archer C50 3 - Denial of Service (PoC)"webappshardwarethewhiteh4t
2020-03-26"Centreo 19.10.8 - 'DisplayServiceStatus' Remote Code Execution"webappsphp"Engin Demirbilek"
2020-03-25"10-Strike Network Inventory Explorer 8.54 - 'Add' Local Buffer Overflow (SEH)"localwindows"Felipe Winsnes"
2020-03-25"Joomla! Component GMapFP 3.30 - Arbitrary File Upload"webappsphpThelastVvV
2020-03-25"10-Strike Network Inventory Explorer - 'srvInventoryWebServer' Unquoted Service Path"localwindows"Felipe Winsnes"
2020-03-25"LeptonCMS 4.5.0 - Persistent Cross-Site Scripting"webappsphpSunCSR
2020-03-25"AVAST SecureLine 5.5.522.0 - 'SecureLine' Unquoted Service Path"localwindows"Roberto Piña"
Release DateTitleTypePlatformAuthor
2020-03-23"ProficySCADA for iOS 5.0.25920 - 'Password' Denial of Service (PoC)"dosios"Ivan Marmolejo"
2020-02-03"P2PWIFICAM2 for iOS 10.4.1 - 'Camera ID' Denial of Service (PoC)"dosios"Ivan Marmolejo"
2019-11-28"GHIA CamIP 1.2 for iOS - 'Password' Denial of Service (PoC)"dosios"Ivan Marmolejo"
2019-11-26"iNetTools for iOS 8.20 - 'Whois' Denial of Service (PoC)"dosios"Ivan Marmolejo"
2019-11-20"iOS 12.4 - Sandbox Escape due to Integer Overflow in mediaserverd"dosios"Google Security Research"
2019-11-19"scadaApp for iOS - 'Servername' Denial of Service (PoC)"dosios"Luis Martínez"
2019-11-18"Open Proficy HMI-SCADA - 'Password' Denial of Service (PoC)"dosios"Luis Martínez"
2019-11-11"iOS IOUSBDeviceFamily 12.4.1 - 'IOInterruptEventSource' Heap Corruption (PoC)"dosios"Sem Voigtlander"
2019-09-24"iMessage - Decoding NSSharedKeyDictionary Can Read Object Out of Bounds"dosios"Google Security Research"
2019-05-23"Visual Voicemail for iPhone - IMAP NAMESPACE Processing Use-After-Free"dosios"Google Security Research"
2019-05-06"iOS 12.1.3 - 'cfprefsd' Memory Corruption"dosiosZecOps
2018-11-06"FaceTime - RTP Video Processing Heap Corruption"dosios"Google Security Research"
2018-10-22"Apple iOS - Kernel Stack Memory Disclosure due to Failure to Check copyin Return Value"dosios"Google Security Research"
2018-10-22"Apple iOS Kernel - Use-After-Free due to bad Error Handling in Personas"dosios"Google Security Research"
2018-09-03"Symantec Mobile Encryption for iPhone 2.1.0 - 'Server' Denial of Service (PoC)"dosios"Luis Martínez"
2018-09-03"Trend Micro Virtual Mobile Infrastructure 5.5.1336 - 'Server address' Denial of Service (PoC)"dosios"Luis Martínez"
2018-08-29"Cisco AnyConnect Secure Mobility Client 4.6.01099 - 'Introducir URL' Denial of Service (PoC)"dosios"Luis Martínez"
2018-08-27"Trend Micro Enterprise Mobile Security - 'Servidor' Denial of Service (PoC)"dosios"Luis Martínez"
2018-06-05"WebKit - not_number defineProperties UAF (Metasploit)"remoteiosMetasploit
2018-05-16"WhatsApp 2.18.31 - Memory Corruption"dosios"Juan Sacco"
2018-01-08"Photos in Wifi 1.0.1 - Path Traversal"webappsiosVulnerability-Lab
2017-11-20"iOS < 11.1 / tvOS < 11.1 / watchOS < 4.1 - Denial of Service"dosios"Russian Otter"
2017-11-01"WhatsApp 2.17.52 - Memory Corruption"dosios"Juan Sacco"
2017-10-17"Apple iOS 10.2 (14C92) - Remote Code Execution"remoteios"Google Security Research"
2017-09-25"Apple iOS 10.2 - Broadcom Out-of-Bounds Write when Handling 802.11k Neighbor Report Response"remoteios"Google Security Research"
2017-08-26"Apple iOS < 10.3.1 - Kernel"localios"Zimperium zLabs Team"
2017-05-17"Apple iOS < 10.3.2 - Notifications API Denial of Service"dosiosCoffeeBreakers
2017-02-21"Lock Photos Album&Videos Safe 4.3 - Directory Traversal"webappsiosVulnerability-Lab
2017-02-20"Album Lock 4.0 iOS - Directory Traversal"webappsiosVulnerability-Lab
2016-12-12"iOS 10.1.x - Certificate File Memory Corruption"dosios"Maksymilian Arciemowicz"
Release DateTitleTypePlatformAuthor
2020-02-10"iOS/macOS - Out-of-Bounds Timestamp Write in IOAccelCommandQueue2::processSegmentKernelCommand()"dosmultiple"Google Security Research"
2020-02-10"usersctp - Out-of-Bounds Reads in sctp_load_addresses_from_init"doslinux"Google Security Research"
2020-01-28"macOS/iOS ImageIO - Heap Corruption when Processing Malformed TIFF Image"dosmultiple"Google Security Research"
2020-01-14"Android - ashmem Readonly Bypasses via remap_file_pages() and ASHMEM_UNPIN"dosandroid"Google Security Research"
2020-01-14"WeChat - Memory Corruption in CAudioJBM::InputAudioFrameToJBM"dosandroid"Google Security Research"
2019-12-18"macOS 10.14.6 (18G87) - Kernel Use-After-Free due to Race Condition in wait_for_namespace_event()"dosmacos"Google Security Research"
2019-12-16"Linux 5.3 - Privilege Escalation via io_uring Offload of sendmsg() onto Kernel Thread with Kernel Creds"locallinux"Google Security Research"
2019-12-11"Adobe Acrobat Reader DC - Heap-Based Memory Corruption due to Malformed TTF Font"doswindows"Google Security Research"
2019-11-22"macOS 10.14.6 - root->kernel Privilege Escalation via update_dyld_shared_cache"localmacos"Google Security Research"
2019-11-22"Internet Explorer - Use-After-Free in JScript Arguments During toJSON Callback"doswindows"Google Security Research"
2019-11-20"Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs"doslinux"Google Security Research"
2019-11-20"Ubuntu 19.10 - ubuntu-aufs-modified mmap_region() Breaks Refcounting in overlayfs/shiftfs Error Path"doslinux"Google Security Research"
2019-11-20"iOS 12.4 - Sandbox Escape due to Integer Overflow in mediaserverd"dosios"Google Security Research"
2019-11-11"Adobe Acrobat Reader DC for Windows - Use of Uninitialized Pointer due to Malformed OTF Font (CFF Table)"doswindows"Google Security Research"
2019-11-11"iMessage - Decoding NSSharedKeyDictionary can read ObjC Object at Attacker Controlled Address"dosmultiple"Google Security Research"
2019-11-11"Adobe Acrobat Reader DC for Windows - Use of Uninitialized Pointer due to Malformed JBIG2Globals Stream"doswindows"Google Security Research"
2019-11-05"macOS XNU - Missing Locking in checkdirs_callback() Enables Race with fchdir_common()"dosmacos"Google Security Research"
2019-11-05"WebKit - Universal XSS in JSObject::putInlineSlow and JSValue::putToPrimitive"dosmultiple"Google Security Research"
2019-11-05"JavaScriptCore - Type Confusion During Bailout when Reconstructing Arguments Objects"dosmultiple"Google Security Research"
2019-10-30"JavaScriptCore - GetterSetter Type Confusion During DFG Compilation"dosmultiple"Google Security Research"
2019-10-28"WebKit - Universal XSS in HTMLFrameElementBase::isURLAllowed"dosmultiple"Google Security Research"
2019-10-21"Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed JP2 Stream (2)"doswindows"Google Security Research"
2019-10-10"Windows Kernel - win32k.sys TTF Font Processing Pool Corruption in win32k!ulClearTypeFilter"doswindows"Google Security Research"
2019-10-10"Windows Kernel - NULL Pointer Dereference in nt!MiOffsetToProtos While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in CI!HashKComputeFirstPageHash While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in nt!MiRelocateImage While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in CI!CipFixImageType While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in nt!MiParseImageLoadConfig While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-09"XNU - Remote Double-Free via Data Race in IPComp Input Path"dosmacos"Google Security Research"
2019-10-04"Android - Binder Driver Use-After-Free"localandroid"Google Security Research"
import requests
response = requests.get('')

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