Seeyon Office Anywhere (OA) A8 Unauthenticated Arbitrary File Write via htmlofficeservlet
Vulnerability Description
Seeyon OA A8 contains an unauthenticated arbitrary file write vulnerability in the /seeyon/htmlofficeservlet endpoint that allows remote attackers to write arbitrary files to the web application root by sending specially crafted POST requests with custom base64-encoded payloads. Attackers can write JSP webshells to the web root and execute them through the web server to achieve arbitrary OS command execution with web server privileges. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-03-26 (UTC).
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- The Shadowserver Foundation
References
- https://sourceforge.net/software/product/A8/
- https://web.archive.org/web/20190821034711/http://wyb0.com/posts/2019/seeyon-htmlofficeservlet-getshell/
- https://wiki.96.mk/Web%E5%AE%89%E5%85%A8/%E8%87%B4%E8%BF%9Coa/%E8%87%B4%E8%BF%9C%20OA%20A8%20htmlofficeservlet%20getshell%20%E6%BC%8F%E6%B4%9E/
- https://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/90916/Security_Notification_reseller_en-US.pdf
- https://www.broadcom.com/support/security-center/attacksignatures/detail?asid=31713
- https://www.fortiguard.com/encyclopedia/ips/48874/seeyon-office-anywhere-htmlofficeservlet-arbitrary-file-upload
- https://www.vulncheck.com/advisories/seeyon-office-anywhere-oa-a8-unauthenticated-arbitrary-file-write-via-htmlofficeservlet
Affected Vendor
Seeyon Internet Software
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