MirBSD MirOS 33 Korn Shell privileges management

EntryHistoryDiffjsonxmlCTI

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.
8.0	$0-$5k	0.00

A vulnerability was found in MirBSD MirOS 33. It has been rated as critical. This issue affects an unknown code of the component Korn Shell. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Korn shell (aka mksh) before R33d on MirOS (aka MirBSD) does not flush the tty s I/O when invoking mksh in a new terminal, which allows local users to gain privileges by opening a virtual terminal and entering command sequences, which might later be executed in opportunistic circumstances by a different user who launches mksh and specifies that terminal with the -T option.

The bug was discovered 04/14/2008. The weakness was released 04/12/2008 (Website). It is possible to read the advisory at xforce.iss.net. The identification of this vulnerability is CVE-2008-1845 since 04/16/2008. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 32067 (FreeBSD : mksh -- TTY attachment privilege escalation (86c05550-12c1-11dd-bab7-0016179b2dd5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Upgrading to version 33 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (41794) and Tenable (32067).

Productinfo

Vendor

MirBSD

Name

MirOS

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.0

VulDB Base Score: 8.4
VulDB Temp Score: 8.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: 🔍
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Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

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: 32067
Nessus Name: FreeBSD : mksh -- TTY attachment privilege escalation (86c05550-12c1-11dd-bab7-0016179b2dd5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 60884
OpenVAS Name: FreeBSD Ports: mksh
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: MirOS 33

Timelineinfo

04/12/2008 🔍
04/14/2008 +1 days 🔍
04/14/2008 +0 days 🔍
04/14/2008 +0 days 🔍
04/16/2008 +1 days 🔍
04/16/2008 +0 days 🔍
04/16/2008 +0 days 🔍
04/25/2008 +9 days 🔍
04/28/2008 +3 days 🔍
05/05/2008 +7 days 🔍
03/16/2015 +2506 days 🔍
08/09/2019 +1607 days 🔍

Sourcesinfo

Advisory: xforce.iss.net
Status: Not defined
Confirmation: 🔍

CVE: CVE-2008-1845 (🔍)
X-Force: 41794
Vulnerability Center: 18302 - MirBSD Korn Shell < R33d Local Privilege Escalation via a Virtual Terminal, High
SecurityFocus: 28768 - MirBSD Korn Shell Local Privilege Escalation Vulnerability
Secunia: 29803
OSVDB: 44365 - MirBSD Korn Shell (mksh) TTY Attachment Local Privilege Escalation

Entryinfo

Created: 03/16/2015 17:00
Updated: 08/09/2019 21:09
Changes: 03/16/2015 17:00 (75), 08/09/2019 21:09 (5)
Complete: 🔍