Fastjson Remote Code Execution Vulnerability Threat Alert

Fastjson Remote Code Execution Vulnerability Threat Alert

July 23, 2019 | Mina Hao

Overview

Recently, a security researcher discovered an issue with the fixes for multiple versions of fastjson. Despite these fixes, an attacker could remotely execute code on a server running fastjson via a carefully crafted request. This issue affects fastjson 1.2.47 and earlier and does not require enabling the autotype option.

Affected Versions

  • Fastjson <= 1.2.47

Unaffected Versions

  • Fastjson > 1.2.47

Users are advised to upgrade to 1.2.51 or the latest version 1.2.58.

Solutions

Fastjson has released version 1.2.58 to fix the preceding vulnerability. Affected users are advised to upgrade as soon as possible.

Alternatively, uses can use WAF to block requests that contain “@type” or encoded forms of “@type”.

Reference:

https://github.com/alibaba/fastjson

Statement

This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.

About NSFOCUS

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