ed0e1e4d44
1979 changes to exploits/shellcodes Couchdb 1.5.0 - 'uuids' Denial of Service Apache CouchDB 1.5.0 - 'uuids' Denial of Service Beyond Remote 2.2.5.3 - Denial of Service (PoC) udisks2 2.8.0 - Denial of Service (PoC) Termite 3.4 - Denial of Service (PoC) SoftX FTP Client 3.3 - Denial of Service (PoC) Silverstripe 2.3.5 - Cross-Site Request Forgery / Open redirection SilverStripe CMS 2.3.5 - Cross-Site Request Forgery / Open Redirection Silverstripe CMS 3.0.2 - Multiple Vulnerabilities SilverStripe CMS 3.0.2 - Multiple Vulnerabilities Silverstripe CMS 2.4 - File Renaming Security Bypass SilverStripe CMS 2.4 - File Renaming Security Bypass Silverstripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities SilverStripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities Silverstripe CMS 2.4.7 - 'install.php' PHP Code Injection SilverStripe CMS 2.4.7 - 'install.php' PHP Code Injection Silverstripe Pixlr Image Editor - 'upload.php' Arbitrary File Upload SilverStripe CMS Pixlr Image Editor - 'upload.php' Arbitrary File Upload Silverstripe CMS 2.4.x - 'BackURL' Open Redirection SilverStripe CMS 2.4.x - 'BackURL' Open Redirection Silverstripe CMS - 'MemberLoginForm.php' Information Disclosure SilverStripe CMS - 'MemberLoginForm.php' Information Disclosure Silverstripe CMS - Multiple HTML Injection Vulnerabilities SilverStripe CMS - Multiple HTML Injection Vulnerabilities Apache CouchDB 1.7.0 and 2.x before 2.1.1 - Remote Privilege Escalation Apache CouchDB 1.7.0 / 2.x < 2.1.1 - Remote Privilege Escalation Monstra CMS before 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (2) Monstra CMS < 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (1) Navigate CMS 2.8 - Cross-Site Scripting Collectric CMU 1.0 - 'lang' SQL injection Joomla! Component CW Article Attachments 1.0.6 - 'id' SQL Injection LG SuperSign EZ CMS 2.5 - Remote Code Execution MyBB Visual Editor 1.8.18 - Cross-Site Scripting Joomla! Component AMGallery 1.2.3 - 'filter_category_id' SQL Injection Joomla! Component Micro Deal Factory 2.4.0 - 'id' SQL Injection RICOH Aficio MP 301 Printer - Cross-Site Scripting Joomla! Component Auction Factory 4.5.5 - 'filter_order' SQL Injection RICOH MP C6003 Printer - Cross-Site Scripting Linux/ARM - Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (28 Bytes) Linux/ARM - sigaction() Based Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (52 Bytes)
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1172
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Using lldb inside a simple hello_world app for iOS we can see that there are over 600 classes which we could get deserialized
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(for persistance for example.)
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The TextInput framework which is loaded has a class TIKeyboardLayout. The initWithCoder: implementation has this code:
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(this is the x86 code, the framework is there on both platforms.)
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mov r15, cs:selRef_decodeBytesForKey_returnedLength_
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lea rdx, cfstr_Frames ; "frames"
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lea rcx, [rbp+var_40] <-- length of serialized binary data
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mov rdi, r14
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mov rsi, r15
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call r13 ; _objc_msgSend
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mov r12, rax <-- pointer to serialized binary data
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mov rdx, [rbp+var_40]
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shr rdx, 3 <-- divide length by 8
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mov rax, cs:_OBJC_IVAR_$_TIKeyboardLayout__count ; uint64_t _count;
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mov [rbx+rax], rdx
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mov rsi, cs:selRef_ensureFrameCapacity_
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mov rdi, rbx
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call r13 ; _objc_msgSend <-- will calloc(len/8, 8) and assign to _frames
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mov rax, cs:_OBJC_IVAR_$_TIKeyboardLayout__frames ; struct _ShortRect *_frames;
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mov rdi, [rbx+rax] ; void *
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mov rdx, [rbp+var_40] ; size_t <-- original length not divided by 8
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mov rsi, r12 ; void *
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call _memcpy <-- can memcpy up to 7 bytes more than was allocated
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This method reads binary data from the NSCoder, it divides the length by 8 and passes that to ensureFrameCapacity
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which passes it to calloc with an item size of 8. This has the effect of mallocing the original size rounded down
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to the nearest multiple of 8.
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The memcpy then uses the original length (not rounded down) causing a controlled heap buffer overflow.
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I've created a serialized TIKeyboardLayout with a frames value which is "A"*0x107.
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Use ASAN to see the crash clearly (see provided compiler invokation.)
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tested on MacOS 10.12.3 (16D32)
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/42051.zip |