![]() New changeset ece5dfd403dac211f8d3c72701fe7ba7b7aa5b5f by Miss Islington (bot) in branch '3.8':Ĭloses bpo-42938: Replace snprintf with Python unicode formatting in ctypes param reprs. closes bpo-42938: Replace snprintf with Python unicode formatting in ctypes param reprs. New changeset 916610ef90a0d0761f08747f7b0905541f0977c7 by Benjamin Peterson in branch 'master':Ĭloses bpo-42938: Replace snprintf with Python unicode formatting in ctypes param reprs. ![]() I recommend _always_ controlling how much you copy so I'd use snprintf with a size argument instead.Īuthor: Benjamin Peterson (benjamin.peterson) * *** buffer overflow detected ***: terminated This could potentially cause RCE when a user allows untrusted input in these functions. For example we could make it copy 1e300 which would be a 1 with 300 zero's to overflow the buffer. The buffer overflow happens due to not checking the length of th sprintf() function on line:īecause we control self->value.d we could make it copy _extreme_ values. There's a buffer overflow in the P圜Arg_repr() function in _ctypes/callproc.c. Python 3.10, Python 3.9, Python 3.8, Python 3.7, Python 3.6Īlexander Riccio, JordyZomer, benjamin.peterson, christian.heimes, milanjugessur1404, miss-islington, vstinnerĬreated on 08:03 by JordyZomer, last changed 14:59 by admin. =21975= by 0x4ACEBC: PS_options (post.Ctypes double representation BoF =21975= Process terminating with default action of signal 6 (SIGABRT) *** buffer overflow detected ***: gnuplot terminated Set term postscript port enhanced'coitledaswed lw 1 "De_aVuSastscriptset outpRt "tempNps"' =21975= Command: gnuplot -d -c /home/aceteam/POC =21975= Using Valgrind-3.13.0 and LibVEX rerun with -h for copyright info =21975= Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. $37 = * ASAN Output =21975= Memcheck, a memory error detector Sprintf(PS_default_font,"%s,%.2g",ps_params->font,ps_fontsize) gef➤ p _sprintf Term->h_char = (unsigned int)(ps_fontsize*PS_SCF*6/10) Term->h_char = (unsigned int)(ps_fontsize*PS_SCF*5/10) ![]() ![]() Which buffer size of both ps_params->font ps_fontsize together is larger than the allocated buffer in PS_default_font which triggered a buffer overflow vulnerability. When a crafted input file is sent to the binary, we observed that ps_params->font had a size of 51 and ps_fontsize with size 14. PS_default_font consists of a buffer value of 51. In our research we found that in function PS_options() in program m, There exists an condition if (ps_params->oldstyle) where the value of ps_params->oldstyle is zero and makes the program enter to the else section, where it calls sprintf() as we observed the basic syntax of sprintf() in this program is sprintf(BUFFERSIZE,char,int). This allows an attacker to cause Denial of Service (Segmentation fault and Memory Corruption) or possibly have unspecified other impacts when a victim opens a specially crafted file. This can be triggered by sending a crafted file to gnuplot. Gnuplot is a portable command-line driven graphing utility.ĭuring our research on the gnuplot, we found buffer overflow vulnerability. Buffer overflow vulnerability in PS_options() – gnuplot 5.2.5ĬWE-120: Classic Buffer Overflow Product Details
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