Vulnerability identifier: #VU42524

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4359

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ProFTPD
Server applications / File servers (FTP/HTTP)

Vendor: ProFTPD

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Integer overflow in kbdint.c in mod_sftp in ProFTPD 1.3.4d and 1.3.5r3 allows remote attackers to cause a denial of service (memory consumption) via a large response count value in an authentication request, which triggers a large memory allocation.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ProFTPD: 1.3.4 - 1.3.5

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External links
http://bugs.proftpd.org/show_bug.cgi?id=3973
http://kingcope.wordpress.com/2013/09/11/proftpd-mod_sftpmod_sftp_pam-invalid-pool-allocation-in-kbdint-authentication/
http://lists.opensuse.org/opensuse-updates/2013-10/msg00032.html
http://lists.opensuse.org/opensuse-updates/2015-06/msg00020.html
http://www.debian.org/security/2013/dsa-2767
http://www.openwall.com/lists/oss-security/2013/09/17/6

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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