VDB-121094 · CVE-2018-8238 · BID 104619

Microsoft Lync/Skype for Business Security Feature 7pk security

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

A vulnerability was found in Microsoft Lync and Skype for Business (Unified Communication Software) (affected version unknown). It has been rated as critical. Affected by this issue is an unknown functionality of the component Security Feature. The manipulation with an unknown input leads to a 7pk security vulnerability. Using CWE to declare the problem leads to CWE-254. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages, aka "Skype for Business and Lync Security Feature Bypass Vulnerability." This affects Skype, Microsoft Lync.

The bug was discovered 07/10/2018. The weakness was shared 07/10/2018 as confirmed security update guide (Website). The advisory is available at portal.msrc.microsoft.com. The vendor cooperated in the coordination of the public release. This vulnerability is handled as CVE-2018-8238 since 03/14/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/01/2020). This vulnerability is assigned to T1211 by the MITRE ATT&CK project. The advisory points out:

A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages. An attacker who successfully exploited the vulnerability could execute arbitrary commands in the context of the logged-in user. The security feature bypass by itself does not allow arbitrary code execution. Instead, an attacker would have to convince users to click a link to a file.

The vulnerability scanner Nessus provides a plugin with the ID 111045 (Security Updates for Microsoft Skype for Business and Microsoft Lync (July 2018)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 110320 (Microsoft Office and Microsoft Office Services and Web Apps Security Update July 2018).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111045). The entries 121098, 121105, 121106 and 121113 are related to this item.

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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: 7.0
VulDB Meta Temp Score: 6.9

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: 7pk security
CWE: CWE-254
ATT&CK: T1211

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111045
Nessus Name: Security Updates for Microsoft Skype for Business and Microsoft Lync (July 2018)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
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Timelineinfo

03/14/2018 🔍
07/10/2018 +117 days 🔍
07/10/2018 +0 days 🔍
07/10/2018 +0 days 🔍
07/10/2018 +0 days 🔍
07/10/2018 +0 days 🔍
07/11/2018 +1 days 🔍
07/13/2018 +2 days 🔍
03/01/2020 +597 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2018-8238 (🔍)
OVAL: 🔍

SecurityFocus: 104619 - Microsoft Skype for Business and Lync CVE-2018-8238 Security Bypass Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20140918
See also: 🔍

Entryinfo

Created: 07/11/2018 10:10
Updated: 03/01/2020 15:17
Changes: 07/11/2018 10:10 (73), 03/01/2020 15:17 (5)
Complete: 🔍

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