VDB-124010 · CVE-2018-16743 · Nessus 117855

Mgetty up to 1.2.0 login.c strcpy Username memory corruption

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.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Mgetty up to 1.2.0. The impacted element is the function strcpy of the file contrib/next-login/login.c. Such manipulation of the argument Username as part of Parameter leads to memory corruption. This vulnerability is referenced as CVE-2018-16743. The attack can only be performed from a local environment. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mgetty up to 1.2.0. It has been rated as critical. Affected by this issue is the function strcpy of the file contrib/next-login/login.c. The manipulation of the argument username as part of a Parameter leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in mgetty before 1.2.1. In contrib/next-login/login.c, the command-line parameter username is passed unsanitized to strcpy(), which can cause a stack-based buffer overflow.

The bug was discovered 09/11/2018. The weakness was published 09/13/2018 (Website). The advisory is available at x41-dsec.de. This vulnerability is handled as CVE-2018-16743 since 09/09/2018. The exploitation is known to be easy. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117855 (openSUSE Security Update : mgetty (openSUSE-2018-1080)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171593 (SUSE Enterprise Linux Security Update for mgetty (SUSE-SU-2018:2850-1)).

Upgrading to version 1.2.1 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117855). Similar entries are available at VDB-124008, VDB-124009, VDB-124011 and VDB-124012. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Mgetty

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
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: 117855
Nessus Name: openSUSE Security Update : mgetty (openSUSE-2018-1080)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Mgetty 1.2.1

Timelineinfo

09/09/2018 🔍
09/11/2018 +2 days 🔍
09/13/2018 +1 days 🔍
09/13/2018 +0 days 🔍
09/14/2018 +1 days 🔍
09/28/2018 +14 days 🔍
10/01/2018 +3 days 🔍
03/23/2020 +539 days 🔍

Sourcesinfo

Advisory: x41-dsec.de
Status: Confirmed

CVE: CVE-2018-16743 (🔍)
GCVE (CVE): GCVE-0-2018-16743
GCVE (VulDB): GCVE-100-124010
See also: 🔍

Entryinfo

Created: 09/14/2018 07:11
Updated: 03/23/2020 15:45
Changes: 09/14/2018 07:11 (75), 03/23/2020 15:45 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.