GStreamer gst-plugins-bad Plugin – NULL Pointer Dereference
Source: https://bugzilla.gnome.org/show_bug.cgi?id=775120 The attached file will cause a null pointer access and segfault in the mpegts parser. Current git code, found with afl. ASAN stack trace: ================================================================= ==32545==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fe957185495 bp 0x60200002cf7a sp 0x7fe956e027a0 T2) ==32545==The signal is caused by a WRITE memory access. ==32545==Hint: address points to the zero page. #0 0x7fe957185494 in _parse_pat /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:441:32 #1 0x7fe957184058 in __common_section_checks /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:166:9 #2 0x7fe95718522f in gst_mpegts_section_get_pat /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:480:9 #3 0x7fe957438b9a in mpegts_base_apply_pat /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:942:20 #4 0x7fe957438b9a in mpegts_base_handle_psi /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1155 #5 0x7fe957437cd1 in mpegts_base_chain /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1424:11 #6 0x7fe9574341e7 in mpegts_base_loop /f/gstreamer/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c:1589:13 #7 0x7fe9644305c3 in gst_task_func /f/gstreamer/gstreamer/gst/gsttask.c:334:5 #8 0x7fe96362f867 (/usr/lib64/libglib-2.0.so.0+0x70867) #9 0x7fe96362eed4 (/usr/lib64/libglib-2.0.so.0+0x6fed4) #10 0x7fe9630ac443 in start_thread (/lib64/libpthread.so.0+0x7443) #11 0x7fe962bdb92c in clone (/lib64/libc.so.6+0xe792c) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /f/gstreamer/gst-plugins-bad/gst-libs/gst/mpegts/gstmpegtssection.c:441:32 in _parse_pat Thread T2 (tsdemux0:sink) created by T1 (typefind:sink) here: #0 0x42e26d in __interceptor_pthread_create (/usr/bin/gst-discoverer-1.0+0x42e26d) #1 0x7fe96364cadf (/usr/lib64/libglib-2.0.so.0+0x8dadf) Thread T1 (typefind:sink) created by T0 here: #0 0x42e26d in __interceptor_pthread_create (/usr/bin/gst-discoverer-1.0+0x42e26d) #1 0x7fe96364cadf (/usr/lib64/libglib-2.0.so.0+0x8dadf) ==32545==ABORTING Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42162.zip |