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CVE-2021-31684: ArrayIndexOutOfBoundsException in parser · Issue #10 · netplex/json-smart-v1
A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.
The parser fails to throw the ParseException when the parser read the unclosed ', the following example input could cause the ArrayIndexOutOfBoundsException:
In detail, when the parser tries to find closed single quotation mark using indexOf function, the iteration variable is not sets corretly in line 79:
It shouldn’t be the pos to be checked less than len. Instead, the i should be checked. The correct way in line 79 is:
for (int i = pos; i < len; i++)
Any input with unclosed single quotation mark could trigger this. Like the input of 'c, cause the ArrayIndexOutOfBoundsException
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