Buffer Over Flow

pankajwashere
Joined:: 2022-05-27
Posts:: 1
Location:: nepal

Buffer Over Flow

2022-05-27 07:47

Hello team,

Found and Buffer over flow issue due to MSFTEDIT.DLL module

Steps to generate .
Upload any notepad file 247977 + kb file to ssh server
now try to edit from winscp editor
Buffer Over Executed

(5614.4c88): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=0266ac68 ecx=000000cd edx=000000cc esi=0266ac68 edi=0076eee4
eip=5b858395 esp=0076f0e4 ebp=0076f0f4 iopl=0         nv up ei pl nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010206
MSFTEDIT!CCallMgr::CCallMgr+0x90:

bufferoverflow.png (21.81 KB)

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,040
Location:: Prague, Czechia

Re: Buffer Over Flow

2022-05-30

WinSCP internal editor is indeed not capable of editing 200 MB files.
You should have actually got a warning when trying to edit such large file. Did you? If not, you might have suppressed the warning in the past.

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