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Denial of service in BearFTP



Published: 2020-02-14
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-8815
CWE ID CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
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BearFTP
Server applications / File servers (FTP/HTTP)

Vendor IKTeam

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource management error

Severity: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-8815

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper connection handling in the base connection handler. A remote attacker can cause a denial of service condition via a Slowloris approach by sending a large volume of small packets.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BearFTP: 0.0.1, 0.1.0, 0.2.0, 0.2.1, 0.3.0

CPE External links

https://github.com/kolya5544/BearFTP
https://github.com/kolya5544/BearFTP/blob/f5a8047587c1a96456d4f291c12b038b9ab0d0c5/BearFTP/Program.cs#L503-L525
https://github.com/kolya5544/BearFTP/commit/17a6ead72d4a25cbfcef5e27613aa0a5f88a4b26
https://github.com/kolya5544/BearFTP/commit/66dc9d95e58bca133f265457d32007cdf38b66ad
https://github.com/kolya5544/BearFTP/releases/tag/0.4.0

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.