Created attachment 1298072 [details] Triggered by "./cflow $POC" Description of problem: There is a heap-buffer-overflow in tokdel() function of cflow. Version-Release number of selected component (if applicable): <= latest version How reproducible: ./cflow POC1 Steps to Reproduce: The information is as follows: $./cflow POC1 ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:51: size_t redefined ./../../../cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition Segmentation fault The ASAN debugging information is as follows: /home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined /home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition /home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined /home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: this is the place of previous definition /home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow:id:000056,sig:11,src:001424,op:ext_AO,pos:1449:46: size_t redefined ... ================================================================= ==53508==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7ffacabd9400 at pc 0x0000004a9542 bp 0x7ffc3515aea0 sp 0x7ffc3515a658 READ of size 752136 at 0x7ffacabd9400 thread T0 #0 0x4a9541 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4a9541) #1 0x4fc8c4 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4fc8c4) #2 0x4fbc57 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4fbc57) #3 0x4fb5b5 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4fb5b5) #4 0x4f2085 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4f2085) #5 0x7ffad2e28abf (/lib/x86_64-linux-gnu/libc.so.6+0x20abf) #6 0x438938 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x438938) 0x7ffacabd9400 is located 0 bytes to the right of 752640-byte region [0x7ffacab21800,0x7ffacabd9400) allocated by thread T0 here: #0 0x4bfc45 (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x4bfc45) #1 0x52efdc (/home/icy/real/cflow-1.5-asan/cflow-1.5/install/bin/cflow+0x52efdc) Shadow bytes around the buggy address: 0x0fffd9573230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fffd9573240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fffd9573250: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fffd9573260: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fffd9573270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0fffd9573280:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0fffd9573290: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0fffd95732a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0fffd95732b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0fffd95732c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0fffd95732d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==53508==ABORTING The vulnerability was triggered in function tokdel () at parser.c:238,where the value of (end - beg + 1) * sizeof(token_stack[0])) is too big. 233 void 234 tokdel(int beg, int end) 235 { 236 if (end >= beg) { 237 if (end < tos) 238 memmove(token_stack + beg, token_stack + end + 1, 239 (end - beg + 1) * sizeof(token_stack[0])); 240 tos -= (end - beg + 1); 241 } 242 } Actual results: crash Expected results: crash Additional info: This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact ganshuitao and chaoz.cn if you need more info about the team, the tool or the vulnerability.
This bug appears to have been reported against 'rawhide' during the Fedora 27 development cycle. Changing version to '27'.
This message is a reminder that Fedora 27 is nearing its end of life. On 2018-Nov-30 Fedora will stop maintaining and issuing updates for Fedora 27. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '27'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 27 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
This bug appears to have been reported against 'rawhide' during the Fedora 30 development cycle. Changing version to '30.
cflow-1.6-1.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2019-ef61cfdf11
cflow-1.6-1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2019-f5ae0b5614
cflow-1.6-1.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-f5ae0b5614
cflow-1.6-1.fc29 has been pushed to the Fedora 29 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-ef61cfdf11
cflow-1.6-1.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
cflow-1.6-1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.