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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66 lines
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3.2 KiB
Text
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=986
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The lgdrmserver binder service (/system/bin/lgdrmserver) implements a handle
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system to store pointers to objects allocated by the drm implementation
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(/system/lib/liblgdrm.so).
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In several places, these handles are retrieved from a received binder Parcel, looked up in a SortedVector under a global lock, the lock is
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then released and the handle is passed to one of the DRM_xyz functions in
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liblgdrm.so which then uses the handle without holding any locks.
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The attached PoC simply creates a number of process instances using the function
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DRM_ProcessInit (lgdrm binder ordinal 2), then triggers the race condition by
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trying to cause a double free on one of these instances using DRM_ProcessEnd
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(lgdrm binder ordinal 8). The race window looks something like the following:
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ILGDrmService::ProcessEnd(void* handle) {
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lock(gLock); // <-- second thread takes this lock
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void* process = gProcesses.find(handle); // <-- handle is still valid
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unlock(gLock);
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DRM_ProcessEnd(process);
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lock(gLock); // <-- before first thread takes this lock
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gProcesses.remove(handle);
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unlock(gLock);
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}
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This will result in heap corruption during the second call to DRM_ProcessEnd
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with the (now invalid) process object, which will eventually crash the
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lgdrmserver process (usually during a subsequent call to malloc).
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Several other functions in lgdrmserver follow a similar pattern, and require
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additional locking to be safe.
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The PoC has been tested on an LG G4 running build-id MRA58K
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Build fingerprint: 'lge/p1_global_com/p1:6.0/MRA58K/1624210305d45:user/release-keys'
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Revision: '11'
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ABI: 'arm'
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pid: 32314, tid: 32314, name: lgdrmserver >>> /system/bin/lgdrmserver <<<
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signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xf6e801d8
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r0 00000003 r1 f6b4012c r2 00000008 r3 00000001
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r4 0000001f r5 f6b4012c r6 f6e40140 r7 f6b40134
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r8 f6b40000 r9 000d0027 sl 00000005 fp 00000000
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ip f700f10c sp ffd0c2c8 lr f6b4013c pc f6fd46c2 cpsr 000f0030
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backtrace:
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#00 pc 0004b6c2 /system/lib/libc.so (arena_dalloc_bin_locked_impl.isra.27+365)
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#01 pc 0005c85f /system/lib/libc.so (je_tcache_bin_flush_small+206)
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#02 pc 00055917 /system/lib/libc.so (ifree+290)
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#03 pc 000587a3 /system/lib/libc.so (je_free+374)
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#04 pc 000241c9 /system/lib/liblgdrm.so (DRMPart_ProcessEnd+340)
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#05 pc 00018331 /system/lib/liblgdrm.so (DRM_ProcessEnd+72)
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#06 pc 000056a5 /system/bin/lgdrmserver
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#07 pc 00005fbd /system/bin/lgdrmserver
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#08 pc 00019931 /system/lib/libbinder.so (_ZN7android7BBinder8transactEjRKNS_6ParcelEPS1_j+60)
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#09 pc 0001eccb /system/lib/libbinder.so (_ZN7android14IPCThreadState14executeCommandEi+550)
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#10 pc 0001ee35 /system/lib/libbinder.so (_ZN7android14IPCThreadState20getAndExecuteCommandEv+64)
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#11 pc 0001ee99 /system/lib/libbinder.so (_ZN7android14IPCThreadState14joinThreadPoolEb+48)
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#12 pc 00004661 /system/bin/lgdrmserver
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#13 pc 000174a9 /system/lib/libc.so (__libc_init+44)
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#14 pc 00004784 /system/bin/lgdrmserver
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/41351.zip |