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This pre-authentication file inclusion vulnerability is known as CVE-2021-45467, and was first documented publicly…
CVE-2021-45467 Public exploit Critical · 9.8 EPSS 70.7%
In CWP (aka Control Web Panel or CentOS Web Panel) before 0.9.8.1107, an unauthenticated attacker can use %00 bytes to…
Summary
In Control Web Panel (CWP, also known as CentOS Web Panel), the flaw lies in the /user/loader.php component, where null-byte (%00) sequences in the scripts parameter are mishandled, leading to missing authorization checks. An unauthenticated remote attacker can exploit this over the network with no user interaction by sending a crafted request to /user/loader.php, using %00 bytes to cause an arbitrary API key to be registered, affecting versions before 0.9.8.1107.
Official description · CVE.org
In CWP (aka Control Web Panel or CentOS Web Panel) before 0.9.8.1107, an unauthenticated attacker can use %00 bytes to cause /user/loader.php to register an arbitrary API key, as demonstrated by a /user/loader.php?api=1&scripts= .%00./.%00./api/account_new_create&acc=guadaapi URI. Any number of %00 instances can be used, e.g., .%00%00%00./.%00%00%00./api/account_new_create could also be used for the scripts parameter.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
70.6 / 100
- Exploited
- Yes, in VulnCheck KEV
- Reports
- 1
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 17 months after disclosure.
- Disclosedday 0
- First seen exploitedVulnCheck KEV evidence+17 mo
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 2Initial AccessTA0001
Exploit Public-Facing Application T1190 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · how it is exploited
Unauthenticated web request exploits public-facing application
an unauthenticated attacker can use %00 bytes to cause /user/loader.php
PersistenceTA0003
Create Account T1136 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · primary impact
Creates new account/API credentials, enabling persistence
to register an arbitrary API key
Detection
0 rules for this CVE · 152 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2021-45467 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Exploit Public-Facing ApplicationT1190149 general rules
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Create AccountT11363 general rules
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 1 threat report1 reportweb-assets.esetstatic.com
Reports are matched by finding the exact id CVE-2021-45467 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.