VDB-129007 · CVE-2018-20685 · BID 106531

OpenSSH 7.9 scp Client scp.c Filename access control

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.04

A vulnerability classified as critical was found in OpenSSH 7.9 (Connectivity Software). Affected by this vulnerability is an unknown code of the file scp.c of the component scp Client. The manipulation as part of a Filename leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename.

The bug was discovered 01/11/2019. The weakness was disclosed 01/10/2019 by Harry Sintonen (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2018-20685 since 01/10/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 121197 (Fedora 29 : openssh (2019-f6ff819834)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172008 (SUSE Enterprise Linux Security Update for openssh (SUSE-SU-2019:0132-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (121197). The entries 130369, 130370, 130371 and 133748 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.7

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

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 121197
Nessus Name: Fedora 29 : openssh (2019-f6ff819834)
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: 🔍

Patch: github.com

Timelineinfo

01/10/2019 🔍
01/10/2019 +0 days 🔍
01/10/2019 +0 days 🔍
01/10/2019 +0 days 🔍
01/11/2019 +1 days 🔍
01/11/2019 +0 days 🔍
01/16/2019 +5 days 🔍
01/16/2019 +0 days 🔍
06/26/2023 +1622 days 🔍

Sourcesinfo

Advisory: FEDORA-2019-f6ff819834⛔
Researcher: Harry Sintonen
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-20685 (🔍)
SecurityFocus: 106531 - OpenSSH CVE-2018-20685 Access Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 01/11/2019 08:11
Updated: 06/26/2023 09:30
Changes: 01/11/2019 08:11 (74), 04/28/2020 15:07 (7), 06/26/2023 09:28 (5), 06/26/2023 09:30 (1)
Complete: 🔍

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