CVE-2021-40524
Quick assessment
Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Pure-FTPd是一款FTP（文件传输协议）服务器。 jedisct1 Pure-FTPd 存在代码问题漏洞，该漏洞源于 Pure-FTPd 1.0.49 版本中，服务器中错误的 max_filesize 配额机制允许攻击者上传无限大小的文件，这可能导致拒绝服务或服务器挂起。发生这种情况是因为某个大于零的测试存在未预期初始值 -1。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-40524
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Pure-FTPd 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pure-FTPd是一款FTP（文件传输协议）服务器。 jedisct1 Pure-FTPd 存在代码问题漏洞，该漏洞源于 Pure-FTPd 1.0.49 版本中，服务器中错误的 max_filesize 配额机制允许攻击者上传无限大小的文件，这可能导致拒绝服务或服务器挂起。发生这种情况是因为某个大于零的测试存在未预期初始值 -1。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | n/a | n/a | - |
|
II. Public POCs for CVE-2021-40524
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Pure-FTPd versions 1.0.23 through 1.0.49 contain an arbitrary file upload vulnerability due to max_filesize quota issue, allowing large or unbounded file uploads that can cause server hang or resource exhaustion. | https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2021/CVE-2021-40524.yaml | POC Details |
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Patches & Fixes for CVE-2021-40524 (2)
-
https://github.com/jedisct1/pure-ftpd/pull/158 x_refsource_MISC
Other References for CVE-2021-40524 (1)
-
https://github.com/jedisct1/pure-ftpd/compare/1.0.49...1.0.50 x_refsource_CONFIRM
Same Patch Batch · n/a · 2021-09-05 · 4 CVEs total
| CVE-2021-23439 | 4.2 MEDIUM | Cross-site Scripting (XSS) |
| CVE-2021-40523 | Contiki 代码问题漏洞 | |
| CVE-2021-40516 | WeeChat 缓冲区错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2021-40524
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