Dropbear SSH up to 2016.71 Shell Command Restriction crlf injection

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.
6.0$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Dropbear SSH up to 2016.71. The impacted element is an unknown function of the component Shell Command Restriction. The manipulation leads to crlf injection. This vulnerability is uniquely identified as CVE-2016-3116. The attack is possible to be carried out remotely. Moreover, an exploit is present. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Dropbear SSH up to 2016.71 (SSH Server Software). This issue affects an unknown code of the component Shell Command Restriction. The manipulation with an unknown input leads to a crlf injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

CRLF injection vulnerability in Dropbear SSH before 2016.72 allows remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data.

The bug was discovered 03/14/2016. The weakness was disclosed 03/22/2016 by tintinweb (Website). It is possible to read the advisory at matt.ucc.asn.au. The identification of this vulnerability is CVE-2016-3116 since 03/10/2016. The attack may be initiated remotely. A simple authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 90027 (Dropbear SSH Server < 2016.72 xauth Command Injection), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276016 (Fedora Security Update for dropbear (FEDORA-2016-bc45faa824)).

Upgrading to version 2016.72 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (40119), Tenable (90027), SecurityFocus (BID 84322†) and Vulnerability Center (SBV-57690†). The entries VDB-65355 and VDB-65354 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

Video

Open Video | Show More Videos

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.4
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 90027
Nessus Name: Dropbear SSH Server < 2016.72 xauth Command Injection
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801799
OpenVAS Name: Dropbear SSH CRLF Injection Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: SSH 2016.72

Timelineinfo

03/03/2016 🔍
03/09/2016 +6 days 🔍
03/09/2016 +0 days 🔍
03/10/2016 +1 days 🔍
03/14/2016 +4 days 🔍
03/18/2016 +4 days 🔍
03/22/2016 +4 days 🔍
03/22/2016 +0 days 🔍
03/23/2016 +1 days 🔍
03/24/2016 +1 days 🔍
10/09/2024 +3121 days 🔍

Sourcesinfo

Advisory: 136251
Researcher: tintinweb
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-3116 (🔍)
GCVE (CVE): GCVE-0-2016-3116
GCVE (VulDB): GCVE-100-81407
SecurityFocus: 84322 - Dropbear SSH CVE-2016-3116 Security Bypass Vulnerability
Vulnerability Center: 57690 - Dropbear SSH before 2016.72 Remote CRLF Injection Vulnerability Allows Users to Bypass Shell-Command Restrictions, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 03/23/2016 11:08
Updated: 10/09/2024 04:30
Changes: 03/23/2016 11:08 (83), 07/20/2019 11:20 (7), 07/10/2022 15:23 (3), 07/10/2022 15:29 (1), 10/09/2024 04:30 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!