Paper/Archive/CVE-2021-48016

CVE-2021-48016

DedeCMS DedeCMS — DedeCMS 5.8.1-beta Unauthenticated RCE via plus/flink.php

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 38.2.382 × 207.6 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

DedeCMS through 5.8.1-beta contains a PHP code injection vulnerability in ShowMsg() where the HTTP Referer header is written into a DedeTemplate string and included. Unauthenticated attackers can send a crafted Referer to /plus/flink.php?dopost=save with an empty validate code to execute arbitrary PHP and system commands. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-14.

Affected

ProductAffectedFixed inSource

DedeCMS≤ 5.8.1-beta–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitsrcincite.io/blog/2021/09/30/chasing-a-dream-pwning-the-biggest-cms-in-china.html writeupgithub.com/dedecms/DedeCMS/blob/v5.8.1/include/common.func.php writeupgithub.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/dedecms/dedecms-rce.yaml writeupvulncheck.com/advisories/dedecms-5.8.1-beta-unauthenticated-rce-via-plus-flink-php