Headline
CVE-2022-43253: Heap-buffer-overflow in fallback-motion.cc: put_unweighted_pred_16_fallback · Issue #348 · strukturag/libde265
Libde265 v1.0.8 was discovered to contain a heap-buffer-overflow vulnerability via put_unweighted_pred_16_fallback in fallback-motion.cc. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted video file.
Description
Heap-buffer-overflow (/libde265/build/libde265/liblibde265.so+0x145b6b) in put_unweighted_pred_16_fallback(unsigned short*, long, short const*, long, int, int, int)
Version
$ ./dec265 -h dec265 v1.0.8
usage: dec265 [options] videofile.bin The video file must be a raw bitstream, or a stream with NAL units (option -n).
options: -q, --quiet do not show decoded image -t, --threads N set number of worker threads (0 - no threading) -c, --check-hash perform hash check -n, --nal input is a stream with 4-byte length prefixed NAL units -f, --frames N set number of frames to process -o, --output write YUV reconstruction -d, --dump dump headers -0, --noaccel do not use any accelerated code (SSE) -v, --verbose increase verbosity level (up to 3 times) -L, --no-logging disable logging -B, --write-bytestream FILENAME write raw bytestream (from NAL input) -m, --measure YUV compute PSNRs relative to reference YUV -T, --highest-TID select highest temporal sublayer to decode –disable-deblocking disable deblocking filter –disable-sao disable sample-adaptive offset filter -h, --help show help
Replay
git clone https://github.com/strukturag/libde265.git cd libde265 mkdir build cd build cmake …/ -DCMAKE_CXX_FLAGS="-fsanitize=address" make -j$(nproc) ./dec265/dec265 poc14
ASAN
WARNING: end_of_sub_stream_one_bit not set to 1 when it should be
==52042==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62b000006640 at pc 0x7fcb9155bb6c bp 0x7fffc9714080 sp 0x7fffc9714070 WRITE of size 2 at 0x62b000006640 thread T0 #0 0x7fcb9155bb6b in put_unweighted_pred_16_fallback(unsigned short*, long, short const*, long, int, int, int) (/libde265/build/libde265/liblibde265.so+0x145b6b) #1 0x7fcb9158cce4 in acceleration_functions::put_unweighted_pred(void*, long, short const*, long, int, int, int) const (/libde265/build/libde265/liblibde265.so+0x176ce4) #2 0x7fcb91581740 in generate_inter_prediction_samples(base_context*, slice_segment_header const*, de265_image*, int, int, int, int, int, int, int, PBMotion const*) (/libde265/build/libde265/liblibde265.so+0x16b740) #3 0x7fcb9158c90f in decode_prediction_unit(base_context*, slice_segment_header const*, de265_image*, PBMotionCoding const&, int, int, int, int, int, int, int, int) (/libde265/build/libde265/liblibde265.so+0x17690f) #4 0x7fcb915c77e3 in read_prediction_unit(thread_context*, int, int, int, int, int, int, int, int, int) (/libde265/build/libde265/liblibde265.so+0x1b17e3) #5 0x7fcb915c9264 in read_coding_unit(thread_context*, int, int, int, int) (/libde265/build/libde265/liblibde265.so+0x1b3264) #6 0x7fcb915ca250 in read_coding_quadtree(thread_context*, int, int, int, int) (/libde265/build/libde265/liblibde265.so+0x1b4250) #7 0x7fcb915ca091 in read_coding_quadtree(thread_context*, int, int, int, int) (/libde265/build/libde265/liblibde265.so+0x1b4091) #8 0x7fcb915c1726 in read_coding_tree_unit(thread_context*) (/libde265/build/libde265/liblibde265.so+0x1ab726) #9 0x7fcb915ca9ea in decode_substream(thread_context*, bool, bool) (/libde265/build/libde265/liblibde265.so+0x1b49ea) #10 0x7fcb915cc70f in read_slice_segment_data(thread_context*) (/libde265/build/libde265/liblibde265.so+0x1b670f) #11 0x7fcb9152b6d2 in decoder_context::decode_slice_unit_sequential(image_unit*, slice_unit*) (/libde265/build/libde265/liblibde265.so+0x1156d2) #12 0x7fcb9152bec1 in decoder_context::decode_slice_unit_parallel(image_unit*, slice_unit*) (/libde265/build/libde265/liblibde265.so+0x115ec1) #13 0x7fcb9152ac0f in decoder_context::decode_some(bool*) (/libde265/build/libde265/liblibde265.so+0x114c0f) #14 0x7fcb9152a93d in decoder_context::read_slice_NAL(bitreader&, NAL_unit*, nal_header&) (/libde265/build/libde265/liblibde265.so+0x11493d) #15 0x7fcb9152d43e in decoder_context::decode_NAL(NAL_unit*) (/libde265/build/libde265/liblibde265.so+0x11743e) #16 0x7fcb9152dab3 in decoder_context::decode(int*) (/libde265/build/libde265/liblibde265.so+0x117ab3) #17 0x7fcb91514e95 in de265_decode (/libde265/build/libde265/liblibde265.so+0xfee95) #18 0x55d2d5b14bc9 in main (/libde265/build/dec265/dec265+0x6bc9) #19 0x7fcb91046c86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86) #20 0x55d2d5b129b9 in _start (/libde265/build/dec265/dec265+0x49b9)
0x62b000006640 is located 48 bytes to the right of 25616-byte region [0x62b000000200,0x62b000006610) allocated by thread T0 here: #0 0x7fcb91a3d790 in posix_memalign (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdf790) #1 0x7fcb915661cb in ALLOC_ALIGNED(unsigned long, unsigned long) (/libde265/build/libde265/liblibde265.so+0x1501cb) #2 0x7fcb9156692a in de265_image_get_buffer(void*, de265_image_spec*, de265_image*, void*) (/libde265/build/libde265/liblibde265.so+0x15092a) #3 0x7fcb91568d1a in de265_image::alloc_image(int, int, de265_chroma, std::shared_ptr<seq_parameter_set const>, bool, decoder_context*, long, void*, bool) (/libde265/build/libde265/liblibde265.so+0x152d1a) #4 0x7fcb9154d0cc in decoded_picture_buffer::new_image(std::shared_ptr<seq_parameter_set const>, decoder_context*, long, void*, bool) (/libde265/build/libde265/liblibde265.so+0x1370cc) #5 0x7fcb915343ff in decoder_context::process_slice_segment_header(slice_segment_header*, de265_error*, long, nal_header*, void*) (/libde265/build/libde265/liblibde265.so+0x11e3ff) #6 0x7fcb9152a246 in decoder_context::read_slice_NAL(bitreader&, NAL_unit*, nal_header&) (/libde265/build/libde265/liblibde265.so+0x114246) #7 0x7fcb9152d43e in decoder_context::decode_NAL(NAL_unit*) (/libde265/build/libde265/liblibde265.so+0x11743e) #8 0x7fcb9152dab3 in decoder_context::decode(int*) (/libde265/build/libde265/liblibde265.so+0x117ab3) #9 0x7fcb91514e95 in de265_decode (/libde265/build/libde265/liblibde265.so+0xfee95) #10 0x55d2d5b14bc9 in main (/libde265/build/dec265/dec265+0x6bc9) #11 0x7fcb91046c86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
SUMMARY: AddressSanitizer: heap-buffer-overflow (/libde265/build/libde265/liblibde265.so+0x145b6b) in put_unweighted_pred_16_fallback(unsigned short*, long, short const*, long, int, int, int) Shadow bytes around the buggy address: 0x0c567fff8c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c567fff8c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c567fff8c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c567fff8ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c567fff8cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c567fff8cc0: 00 00 fa fa fa fa fa fa[fa]fa fa fa fa fa fa fa 0x0c567fff8cd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c567fff8ce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c567fff8cf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c567fff8d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c567fff8d10: 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 Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 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 ==52042==ABORTING
POC
https://github.com/FDU-Sec/poc/blob/main/libde265/poc14
Environment
Ubuntu 18.04.5 LTS Clang 10.0.1 gcc 7.5.0
Credit
Peng Deng (Fudan University)
Related news
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Ubuntu Security Notice 6627-1 - It was discovered that libde265 could be made to read out of bounds. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service. It was discovered that libde265 did not properly manage memory. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 22.04 LTS.
Debian Linux Security Advisory 5346-1 - Multiple security issues were discovered in libde265, an implementation of the H.265 video codec which may result in denial of service and potentially the execution of arbitrary code if a malformed media file is processed.