IBM Tivoli Monitoring CVE-2017-1635 Remote Code Execution Vulnerability
CVSS Base Score: 8
Affected Products and Versions: KDH component of IBM Tivoli Monitoring Basic Services (KGL,KAX) for Version 126.96.36.199 through 188.8.131.52
A vulnerability exists in the internal web server provided by IBM Tivoli Monitoring basic services. It could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free error. A remote attacker could exploit this vulnerability to execute arbitrary code on the system or cause the application to crash.
The web server component “KDH”, after receiving certain requests, executes a memory region in the heap previously freed by the component itself.
An attacker is able to fill the heap before the memory is reused, in order to execute arbitrary code.
PoC source: https://github.com/emcalv/tivoli-poc
0x6191BCF8 – malloc in BSS1_NewFormat
0x61903fea – free in BSS1_EndFormat
0x6191BDEF – call to ecx+4
At first, malloc() is called to allocate space (0x400) where application will put response page to the faulty request; then free() is called on the same address used in the “call [ecx+4]” later on.
The disassembly code involved is:
kbb.dll:61903FD7 mov eax, [edx]
kbb.dll:61903FD9 push eax
kbb.dll:61903FDA mov ecx, [ebp-8]
kbb.dll:61903FDD call dword ptr [ecx+4] <- here is called the address of the previously freed heap + 4
Supporting techincal details:
As shown in the following WinDbg screenshot, execution is suspended at 0x004c0931, where the payload is “\xcc” – breakpoint.
Submission to IBM summer 2017, verified and confirmed in November 2017 by IBM.
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