Cisco StarOS on ASR 5000 SSH access control

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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Cisco StarOS on ASR 5000. The impacted element is an unknown function of the component SSH. Performing a manipulation results in access control. This vulnerability was named CVE-2016-1335. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco StarOS on ASR 5000 (Router Operating System) (affected version unknown). It has been classified as critical. This affects an unknown functionality of the component SSH. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The SSH implementation in Cisco StarOS before 19.3.M0.62771 and 20.x before 20.0.M0.62768 on ASR 5000 devices mishandles a multi-user public-key authentication configuration, which allows remote authenticated users to gain privileges by establishing a connection from an endpoint that was previously used for an administrator's connection, aka Bug ID CSCux22492.

The weakness was presented 02/19/2016 with Cisco as CSCux22492 as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2016-1335 since 01/03/2016. It is possible to initiate the attack remotely. The successful exploitation needs a authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 89051 (Cisco ASR 5000 Series StarOS SSH Subsystem Privilege Escalation (CSCux22492)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (89051), SecurityFocus (BID 83304†) and Vulnerability Center (SBV-56729†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Router Operating System

Vendor

Cisco

Name

StarOS

License

commercial

Website

Vendor: https://www.cisco.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

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: Access control
CWE: CWE-264
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: 89051
Nessus Name: Cisco ASR 5000 Series StarOS SSH Subsystem Privilege Escalation (CSCux22492)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/03/2016 🔍
02/17/2016 +45 days 🔍
02/17/2016 +0 days 🔍
02/19/2016 +1 days 🔍
02/19/2016 +0 days 🔍
02/19/2016 +0 days 🔍
02/22/2016 +2 days 🔍
02/23/2016 +1 days 🔍
02/29/2016 +6 days 🔍
07/08/2022 +2320 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCux22492
Organization: Cisco
Status: Confirmed

CVE: CVE-2016-1335 (🔍)
GCVE (CVE): GCVE-0-2016-1335
GCVE (VulDB): GCVE-100-81033
SecurityFocus: 83304 - Cisco StarOS CVE-2016-1335 Privilege Escalation Vulnerability
SecurityTracker: 1035062
Vulnerability Center: 56729 - [cisco-sa-20160218-asr] Cisco StarOS Remote Privilege Escalation due to SSH Implementation Issue, High

Entryinfo

Created: 02/22/2016 14:59
Updated: 07/08/2022 09:06
Changes: 02/22/2016 14:59 (73), 08/23/2018 08:23 (6), 07/08/2022 09:06 (4)
Complete: 🔍
Cache ID: 216:020:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.