OS Command Injection in vsftpd and Debian Linux - CVE-2011-2523
Published: November 27, 2019 / Updated: January 15, 2024
Vulnerability identifier: #VU35024
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2011-2523
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: vsftpd
Debian
Debian
Affected software:
vsftpd
Debian Linux
vsftpd
Debian Linux
Detailed vulnerability description
The 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.
How to mitigate CVE-2011-2523
Install update from vendor's website.
Sources
- https://access.redhat.com/security/cve/cve-2011-2523
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html
- https://security-tracker.debian.org/tracker/CVE-2011-2523
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805
- https://www.openwall.com/lists/oss-security/2011/07/11/5