![]() ![]() Making statements based on opinion back them up with references or personal experience. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers. =21975= by 0x571EA0F: _chk_fail (chk_fail.c:28) Thanks for contributing an answer to Stack Overflow Please be sure to answer the question. ![]() =21975= by 0x5720CFE: _fortify_fail_abort (fortify_fail.c:33) printf () affecting buffer overflow situation Ask Question Asked 5 years ago Modified 3 years, 6 months ago Viewed 2k times 3 I have a simple program that initializes a c style string and then initializes a character. =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. If the cp pointer and the blen argument are used in subsequent snprintf calls (which is often the case when the result from snprintf is used in pointer arithmetic), the buffer overflow vulnerability that snprintf was supposed to deal with resurfaces: cp points outside of the original buffer, and blen wraps around (after the conversion in sizet. 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. #0 0x4dcfaf in main /home/kbabioch/openjpeg/src/bin/mj2/opj_mj2_extract.Buffer overflow vulnerability in PS_options() – gnuplot 5.2.5ĬWE-120: Classic Buffer Overflow Product Details #4 0x41ba68 in _start /home/abuild/rpmbuild/BUILD/glibc-2.22/csu/./sysdeps/x86_64/start.S:118Īddress 0x7ffc920b6792 is located in stack of thread T0 at offset 146 in frame #2 0x4dd97a in main /home/kbabioch/openjpeg/src/bin/mj2/opj_mj2_extract.c:143:9 #1 0x43832b in _interceptor_sprintf /home/abuild/rpmbuild/BUILD/llvm-3.8.0.src/stage2/./projects/compiler-rt/lib/asan/./sanitizer_common/sanitizer_common_interceptors.inc:1159:1 #0 0x437007 in _interceptor_vsprintf /home/abuild/rpmbuild/BUILD/llvm-3.8.0.src/stage2/./projects/compiler-rt/lib/asan/./sanitizer_common/sanitizer_common_interceptors.inc:1128:1 WRITE of size 61 at 0x7ffc920b6792 thread T0 ![]()
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