Recently, two remote code execution vulnerabilities (CVE-2020-9547 and CVE-2020-9548) were fixed in jackson-databind. By using two components (ibatis-sqlmap and anteros-core) to bypass the blacklist restriction, attackers could exploit these vulnerabilities to cause remote code execution on the victim’s machine.
In addition, Fastjson, when using ibatis-sqlmap and anteros-core components and enabling the AutoType function (this function is disabled by default), is also vulnerable to the preceding vulnerabilities.
Jackson-databind 2.x <= 22.214.171.124
Jackson-databind > 126.96.36.199
Jackson-databind has released a new version to fix the preceding vulnerabilities. Affected users are advised to upgrade as soon as possible.
In addition, Fastjson users can disable the AutoType function for risk aversion. Also, they are advised to upgrade the JDK to the latest version.
Users can disable the AutoType function in either of the following ways:
Method 1: 1. Find the following code in the source code and delete it: ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
Method 2: When enabling Fastjson on a Java virtual machine, remember not to add the following parameter: -Dfastjson.parser.autoTypeSupport=true:
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