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
NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.
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