High advisory for DedeCMS

Advisory overview

DedeCMS before 5.7 contains a file inclusion vulnerability in plus/carbuyaction.php that allows remote unauthenticated attackers to control the include path by manipulating the uninitialized code parameter passed to require_once. Attackers can supply path traversal sequences ../../ to include arbitrary local files outside the intended payment directory, potentially achieving local file disclosure. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-18.

Related references

• https://github.com/dedecms/DedeCMS/blob/v5.6/plus/carbuyaction.php
• https://github.com/dedecms/DedeCMS/releases/tag/v5.7
• https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/dedecms/dedecms-carbuyaction-fileinclude.yaml
• https://web.archive.org/web/20100630011301/https://www.myhack58.com/Article/html/3/62/2010/27387.htm
• https://www.cnblogs.com/milantgh/p/3615986.html
• https://www.vulncheck.com/advisories/dedecms-file-inclusion-via-plus-carbuyaction-php