OS Command Injection in vsftpd
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2011-2523 |
| CWE-ID | CWE-78 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
vsftpd Server applications / File servers (FTP/HTTP) Debian Linux Operating systems & Components / Operating system |
| Vendor |
vsftpd Debian |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) OS Command Injection
EUVDB-ID: #VU35024
Risk: High
CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2011-2523
CWE-ID:
CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Exploit availability: Yes
DescriptionThe vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
MitigationInstall update from vendor's website.
Vulnerable software versionsvsftpd: 2.3.4
Debian Linux: 2.3.4 - 9.0
External linkshttp://access.redhat.com/security/cve/cve-2011-2523
http://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html
http://security-tracker.debian.org/tracker/CVE-2011-2523
http://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805
http://www.openwall.com/lists/oss-security/2011/07/11/5
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. However, proof of concept for this vulnerability is available.
