Adobe Flash – ‘.SWF’ Out-of-Bounds Memory Read (1)
Source: https://code.google.com/p/google-security-research/issues/detail?id=361&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id The following access violation was observed in the Adobe Flash Player plugin: (150c.ca0): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. *** ERROR: Symbol file could not be found. Defaulted to export symbols for FlashPlayer.exe - eax=078a53b7 ebx=00f28938 ecx=002dea24 edx=000085ed esi=000085ee edi=09d9eee0 eip=0139a657 esp=002de9b4 ebp=002deda4 iopl=0 nv up ei ng nz ac pe cy cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210297 FlashPlayer!WinMainSandboxed+0x572f0: 0139a657 8a0402 mov al,byte ptr [edx+eax] ds:002b:078ad9a4=?? 0:000> !address eax [...] Usage: <unknown> Base Address: 07560000 End Address: 078ad000 Region Size: 0034d000 State: 00001000 MEM_COMMIT Protect: 00000004 PAGE_READWRITE Type: 00020000 MEM_PRIVATE Allocation Base: 07560000 Allocation Protect: 00000001 PAGE_NOACCESS 0:000> db eax 078a53b7 c5 ea 85 00 00 b6 19 00-38 01 c5 3d 84 9e c2 3d ........8..=...= 078a53c7 2f 48 d5 a0 2b 00 73 65-63 6f 6e 64 00 00 00 03 /H..+.second.... 078a53d7 00 00 00 01 00 00 00 01-00 00 00 00 02 00 00 00 ................ 078a53e7 b7 01 00 00 88 39 00 0a-00 74 68 69 73 00 5f 78 .....9...this._x 078a53f7 00 78 6d 00 5f 79 00 79-6d 00 5f 72 6f 6f 74 00 .xm._y.ym._root. 078a5407 66 69 72 73 74 73 00 63-6c 61 75 73 00 68 70 00 firsts.claus.hp. 078a5417 72 65 6d 6f 76 65 4d 6f-76 69 65 43 6c 69 70 00 removeMovieClip. 078a5427 96 02 00 08 00 1c 96 04-00 08 01 08 00 1c 96 02 ................ Notes: - Reliably reproduces with latest Adobe Flash Player Projector for Windows and Google Chrome for Windows. - The out-of-bounds read appears to be caused by an overly large index value (stored in the "EDX" register at the time of the crash) relative to a dynamically allocated buffer pointed to by "EAX". - The memory under "EAX" contains a section of the input file starting at offset 0x3453b7. - The index (EDX) value originates from offset 0x3453b8 in the file (at 1 byte offset relative to the EAX memory region). - Attached samples: signal_sigsegv_7ffff6d2184d_5692_9217909125eb9174614e1368d5f07173 (crashing file), 9217909125eb9174614e1368d5f07173 (original file). The total difference between the two files is 13 bytes. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37856.zip |