I found a heap buffer overflow in sngrep.
Please confirm.
Thanks!
Test Environment
Ubuntu 20.04, 64 bit sngrep (version: v1.6.0 ;5089514)
How to trigger
Compile the program with AddressSanitizer
Run command $ ./sngrep -N -R -I $PoC
Details
ASAN report
$./sngrep -N -R -I $PoC
Dialog count: 0=================================================================
==974271==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000080a0 at pc 0x0000004d385c bp 0x7f69535f92f0 sp 0x7f69535f92e8
READ of size 2 at 0x6020000080a0 thread T1
#0 0x4d385b in capture_packet_reasm_ip /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:678:49
#1 0x4d0d09 in parse_packet /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:367:17
#2 0x7f695522a466 (/lib/x86_64-linux-gnu/libpcap.so.0.8+0x23466)
#3 0x7f6955218f67 in pcap_loop (/lib/x86_64-linux-gnu/libpcap.so.0.8+0x11f67)
#4 0x4cf5c9 in capture_thread /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:1042:5
#5 0x7f69551ea608 in start_thread /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477:8
#6 0x7f6954f95132 in __clone /build/glibc-SzIz7B/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95
0x6020000080a0 is located 15 bytes to the right of 1-byte region [0x602000008090,0x602000008091)
allocated by thread T1 here:
#0 0x49c3cd in __interceptor_malloc (/home/root/randomFuzz/sngrep/sngrep/sngrep_N_R_I/sngrep+0x49c3cd)
#1 0x4dbb59 in packet_add_frame /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/packet.c:123:19
#2 0x4d31ee in capture_packet_reasm_ip /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:639:9
#3 0x4d0d09 in parse_packet /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:367:17
#4 0x7f695522a466 (/lib/x86_64-linux-gnu/libpcap.so.0.8+0x23466)
Thread T1 created by T0 here:
#0 0x486a8c in pthread_create (/home/root/randomFuzz/sngrep/sngrep/sngrep_N_R_I/sngrep+0x486a8c)
#1 0x4d712c in capture_launch_thread /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:1027:13
#2 0x4efb9e in main /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/main.c:433:9
#3 0x7f6954e9a082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/root/FuzzDateset/sngrep/sngrep-1.6.0/src/capture.c:678:49 in capture_packet_reasm_ip
Shadow bytes around the buggy address:
0x0c047fff8fc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8fd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8fe0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8ff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9000: fa fa 00 00 fa fa fd fa fa fa fd fa fa fa 00 00
=>0x0c047fff9010: fa fa 01 fa[fa]fa fd fd fa fa 00 00 fa fa 01 fa
0x0c047fff9020: fa fa 00 00 fa fa 01 fa fa fa 00 00 fa fa 01 fa
0x0c047fff9030: fa fa 00 00 fa fa 01 fa fa fa 00 00 fa fa 01 fa
0x0c047fff9040: fa fa 00 00 fa fa 01 fa fa fa 00 00 fa fa 01 fa
0x0c047fff9050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9060: 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
==974271==ABORTING
I found a heap buffer overflow in sngrep. Please confirm. Thanks!
Test Environment Ubuntu 20.04, 64 bit sngrep (version: v1.6.0 ;5089514)
How to trigger Compile the program with AddressSanitizer Run command $ ./sngrep -N -R -I $PoC Details ASAN report $./sngrep -N -R -I $PoC
The URL of PoC is PoC