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.
4.6	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in nginx. This impacts the function ngx_mail_smtp_starttls of the component SMTP Proxy. The manipulation of the argument STARTTLS results in command injection. This vulnerability is identified as CVE-2014-3556. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in nginx (Web Server). Affected is the function ngx_mail_smtp_starttls of the component SMTP Proxy. The manipulation of the argument STARTTLS with an unknown input leads to a command injection vulnerability. CWE is classifying the issue as CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. This is going to have an impact on confidentiality.

The weakness was released 08/05/2014 by Chris Boulton as nginx security advisory (CVE-2014-3556) as confirmed advisory (Mailing List). The advisory is shared for download at mailman.nginx.org. The public release was coordinated with the vendor. This vulnerability is traded as CVE-2014-3556 since 05/14/2014. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

The vulnerability scanner Nessus provides a plugin with the ID 77109 (FreeBSD : nginx -- inject commands into SSL session vulnerability (ad747a01-1fee-11e4-8ff1-f0def16c5c1b)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13267 (Nginx STARTTLS Command Injection Vulnerability).

Upgrading to version 1.6.1 or 1.7.4 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at nginx.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

s->buffer->pos = s->buffer->start;
s->buffer->last = s->buffer->start;

Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11309.

The vulnerability is also documented in the databases at X-Force (95167), Tenable (77109), SecurityFocus (BID 69111†), SecurityTracker (ID 1030692†) and Vulnerability Center (SBV-45839†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Web Server

Name

• nginx

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9
• 1.5.10
• 1.5.11
• 1.5.12
• 1.6.0
• 1.6.1
• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

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: Command injection
CWE: CWE-77 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 77109
Nessus Name: FreeBSD : nginx -- inject commands into SSL session vulnerability (ad747a01-1fee-11e4-8ff1-f0def16c5c1b)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: nginx 1.6.1/1.7.4
Patch: nginx.org
TippingPoint: 🔍

Timelineinfo

05/14/2014 🔍
08/05/2014 +83 days 🔍
08/05/2014 +0 days 🔍
08/07/2014 +2 days 🔍
08/07/2014 +0 days 🔍
08/07/2014 +0 days 🔍
08/08/2014 +1 days 🔍
08/10/2014 +2 days 🔍
08/14/2014 +4 days 🔍
12/29/2014 +137 days 🔍
02/10/2022 +2600 days 🔍

Sourcesinfo

Advisory: nginx security advisory (CVE-2014-3556)
Researcher: Chris Boulton
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2014-3556 (🔍)
GCVE (CVE): GCVE-0-2014-3556
GCVE (VulDB): GCVE-100-67296
X-Force: 95167 - nginx ngx_mail_smtp_starttls() command execution, High Risk
SecurityFocus: 69111 - nginx SMTP Proxy Remote Command Injection Vulnerability
SecurityTracker: 1030692 - nginx SMTP Proxy STARTTLS Flaw Lets Remote Users Inject Commands into SSL Sessions to Obtain Potentially Sensitive Information
Vulnerability Center: 45839 - nginx Remote Information Disclosure via Injecting Commands into SSL Sessions, Medium

Entryinfo

Created: 08/08/2014 10:16
Updated: 02/10/2022 09:02
Changes: 08/08/2014 10:16 (84), 06/04/2017 10:49 (2), 02/10/2022 08:58 (3), 02/10/2022 09:02 (1)
Complete: 🔍
Cache ID: 216:826:103

Discussion

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