Ruby up to 2.3.x SMTP Net::SMTP crlf 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.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Ruby up to 2.3.x. It has been classified as critical. This affects the function Net::SMTP of the component SMTP Handler. This manipulation causes crlf injection. This vulnerability is tracked as CVE-2015-9096. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Ruby up to 2.3.x (Programming Language Software). It has been declared as critical. Affected by this vulnerability is the function Net::SMTP of the component SMTP Handler. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.

The bug was discovered 12/11/2015. The weakness was disclosed 06/12/2017 (Website). It is possible to read the advisory at mbsd.jp. This vulnerability is known as CVE-2015-9096 since 06/12/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 549 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101974 (Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities (USN-3365-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196859 (Ubuntu Security Notification for Ruby1.9.1, Ruby2.0, Ruby2.3 Vulnerabilities (USN-3365-1)).

Upgrading to version 2.4.0 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (101974). The entries VDB-95056, VDB-96308 and VDB-99047 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Programming Language Software

Name

Ruby

Version

License

open-source

Website

Product: https://github.com/ruby/ruby/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 101974
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities (USN-3365-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for ruby2.3 USN-3365-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Ruby 2.4.0
Patch: github.com

Timelineinfo

12/11/2015 🔍
06/12/2017 +549 days 🔍
06/12/2017 +0 days 🔍
06/12/2017 +0 days 🔍
06/13/2017 +1 days 🔍
07/25/2017 +42 days 🔍
07/26/2017 +1 days 🔍
12/08/2022 +1961 days 🔍

Sourcesinfo

Product: github.com

Advisory: USN-3365-1
Status: Not defined

CVE: CVE-2015-9096 (🔍)
GCVE (CVE): GCVE-0-2015-9096
GCVE (VulDB): GCVE-100-102247

OVAL: 🔍
See also: 🔍

Entryinfo

Created: 06/13/2017 08:51
Updated: 12/08/2022 12:29
Changes: 06/13/2017 08:51 (77), 10/16/2019 10:32 (2), 12/08/2022 12:15 (5), 12/08/2022 12:22 (1), 12/08/2022 12:29 (1)
Complete: 🔍
Cache ID: 216::103