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Cisco Call Manager CTLProvider Heap Overflow Vulnerability
------------------------------------------------------------------------
SUMMARY
A vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Cisco CallManager. Authentication is not
required to exploit this vulnerability.
DETAILS
Vulnerable Systems:
* Cisco Call Manager version 4.1(3)
The specific flaw exists within the CTL Provider Service, CTLProvider.exe,
which binds to TCP port 2444. The service operates over a SSL encrypted
transport. Due to a logic flaw in the way data is received in a loop a
heap allocation can be arbitrarily overflown resulting in the control of
subsequent heap chunks. This can lead to arbitrary code execution.
The vulnerability is due to a loop that occurs during receive of socket
data. An initial buffer is allocated at 0x19000 bytes, as can bee seen
here.
text:00406077 191A8 68+ push 19000h ; size_t
text:0040607C 191AC FF+ call ds:__imp_malloc
text:00406082 191AC 83+ add esp, 10h
text:00406085 1919C 89+ mov [edi+14h], eax
text:00406088 1919C 85+ test eax, eax
text:0040608A 1919C 0F+ jz loc_406238
Once allocated data is read in 0x19000 chunks. If more than 0x4000 bytes
of data are left on the socket we loop again as can be seen here.
text:004060A5 191AC FF+ push dword ptr [ebp-14h] ; size_t
text:004060A8 191B0 8D+ lea eax, [ebp-1919Ch]
text:004060AE 191B0 50 push eax ; void *
text:004060AF 191B4 8B+ mov eax, [edi+14h]
text:004060B2 191B4 03+ add eax, [ebp-1Ch]
text:004060B5 191B4 50 push eax ; void *
text:004060B6 191B8 E8+ call memcpy
text:004060B6 191B8 2F+
text:004060BB 191B8 B8+ mov eax, 16384
text:004060C0 191B8 83+ add esp, 1Ch
text:004060C3 1919C 39+ cmp [ebp-14h], eax
text:004060C6 1919C 75+ jnz short loc_4060F8
text:004060C8 1919C 50 push eax ; int
text:004060C9 191A0 68+ push offset str__ErrDExceeds16k ; 'err %d
exceeds 16K'
text:004060CE 191A4 8D+ lea eax, [ebp-88h]
text:004060D4 191A4 68+ push 80000h ; int
text:004060D9 191A8 50 push eax ; int
text:004060DA 191AC E8+ call log_message
text:004060DA 191AC B7+
text:004060DF 191AC 83+ add esp, 10h
text:004060E2 1919C 81+ add dword ptr [ebp-1Ch], 4000h
text:004060E9 1919C 68+ push offset
str__MaybeThereIsMoreData__readAgain ; "Maybe there is more data..Read
again"
text:004060EE 191A0 68+ push 10000h
text:004060F3 191A4 E9+ jmp loc_405FFF
This will continue until heap chunks are overwritten at the users control,
which can be exploited to overwrite memory and further lead to arbitrary
code execution.
Vendor Response:
<http://www.cisco.com/warp/public/707/cisco-sa-20080116-cucmctl.shtml>
http://www.cisco.com/warp/public/707/cisco-sa-20080116-cucmctl.shtml
Disclosure Timeline:
2007.06.04 - Vulnerability reported to vendor
2008.01.16 - Coordinated public release of advisory
ADDITIONAL INFORMATION
The information has been provided by <mailto:dvlabs@tippingpoint.com>
DVLabs.
The original article can be found at:
<http://dvlabs.tippingpoint.com/advisory/TPTI-08-02>
http://dvlabs.tippingpoint.com/advisory/TPTI-08-02
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