vsftpd 2.3.4 Service Port 6200 os command injection

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.1	$0-$5k	0.14

Summaryinfo

A vulnerability described as very critical has been identified in vsftpd 2.3.4. This impacts an unknown function of the component Service Port 6200. Executing a manipulation can lead to os command injection. This vulnerability is tracked as CVE-2011-2523. The attack can be launched remotely. Moreover, an exploit is present. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability has been found in vsftpd 2.3.4 (File Transfer Software) and classified as very critical. This vulnerability affects an unknown code block of the component Service Port 6200. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.

The weakness was disclosed 11/27/2019 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2011-2523 since 06/15/2011. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/14/2025). The MITRE ATT&CK project declares the attack technique as T1202.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 27349 (VSftpd Compromised Source Packages Backdoor Vulnerability).

Proper firewalling of tcp/6200 is able to address this issue.

The vulnerability is also documented in the vulnerability database at Exploit-DB (49757). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

File Transfer Software

Name

vsftpd

Version

2.3.4

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.1

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Os command injection
CWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍

Timelineinfo

06/15/2011 🔍
11/27/2019 +3087 days 🔍
11/28/2019 +1 days 🔍
02/14/2025 +1905 days 🔍

Sourcesinfo

Advisory: 162145
Status: Not defined

CVE: CVE-2011-2523 (🔍)
GCVE (CVE): GCVE-0-2011-2523
GCVE (VulDB): GCVE-100-146452
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/28/2019 06:56
Updated: 02/14/2025 10:06
Changes: 11/28/2019 06:56 (39), 11/28/2019 07:01 (18), 02/28/2024 16:26 (4), 01/12/2025 01:41 (16), 02/14/2025 10:06 (13)
Complete: 🔍
Cache ID: 216:730:103