Kaspersky AntiVirus – ‘.DEX’ File Format Parsing Memory Corruption
Source: https://code.google.com/p/google-security-research/issues/detail?id=519 Fuzzing the DEX file format found a crash that loads a function pointer from an attacker controlled pointer, on Windows this results in a call to an unmapped address. This is obviously exploitable for remote, zero-interaction code execution as NT AUTHORITY\SYSTEM on any system with Kaspersky Antivirus. I've tested Windows, Linux, Mac and a product using the Kaspersky SDK (ZoneAlarm Pro), all were exploitable. (5dc.990): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=9c000000 ebx=00000000 ecx=053ef3ec edx=00020009 esi=04130d40 edi=800000d8 eip=9c000000 esp=053eec14 ebp=053eec74 iopl=0 nv up ei pl nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206 9c000000 ?? ??? 0:026> kv ChildEBP RetAddr Args to Child WARNING: Frame IP not in any known module. Following frames may be wrong. 053eec10 1740927e 04137af0 04137ac8 04130d40 0x9c000000 053eecb8 70118a64 04130d40 00000002 04130d40 0x1740927e 053eecd0 70116a1c 04130d40 0000234c 00000001 kavbase_kdl!KLAV_Engine_Create+0x17a62 053eed80 70113829 04130d40 0500234c 00000000 kavbase_kdl!KLAV_Engine_Create+0x15a1a 053eedc0 70117156 04130d40 107407b4 00000001 kavbase_kdl!KLAV_Engine_Create+0x12827 053eee6c 70113926 04130d40 20000001 00000000 kavbase_kdl!KLAV_Engine_Create+0x16154 053eee94 701167f2 04130d40 000001e3 053eeed4 kavbase_kdl!KLAV_Engine_Create+0x12924 053eeea4 70112c28 04130d40 00000067 0e5100a2 kavbase_kdl!KLAV_Engine_Create+0x157f0 053eeed4 70112cef 053eeee0 04130d40 16d30ae0 kavbase_kdl!KLAV_Engine_Create+0x11c26 0:026> .frame /c 1 01 053eecb8 70118a64 0x1740927e eax=9c000000 ebx=00000000 ecx=053ef3ec edx=00020009 esi=04130d40 edi=800000d8 eip=1740927e esp=053eec18 ebp=053eec74 iopl=0 nv up ei pl nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206 1740927e 83c404 add esp,4 0:026> ub 17409269 8b45fc mov eax,dword ptr [ebp-4] 1740926c 85c0 test eax,eax 1740926e 7411 je 17409281 17409270 c745fc00000000 mov dword ptr [ebp-4],0 17409277 8b10 mov edx,dword ptr [eax] 17409279 50 push eax 1740927a 8b02 mov eax,dword ptr [edx] <-- corrupt attacker controlled pointer 1740927c ffd0 call eax <-- attacker gains control of execution Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38284.zip |