VDB-120429 · CVE-2018-3762 · Qualys 171355

Nextcloud Server up to 12.0.7/13.0.2 Permission Request access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

A vulnerability classified as critical has been found in Nextcloud Server up to 12.0.7/13.0.2 (Cloud Software). This affects an unknown functionality of the component Permission. The manipulation as part of a Request leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Nextcloud Server before 12.0.8 and 13.0.3 suffers from improper checks of dropped permissions for incoming shares allowing a user to still request previews for files it should not have access to.

The bug was discovered 06/21/2018. The weakness was shared 07/05/2018 (Website). The advisory is shared at nextcloud.com. This vulnerability is uniquely identified as CVE-2018-3762 since 12/28/2017. The exploitability is told to be easy. 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 was handled as a non-public zero-day exploit for at least 14 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111037 (openSUSE Security Update : nextcloud (openSUSE-2018-712)), 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 171355 (OpenSUSE Security Update for nextcloud (openSUSE-SU-2018:1924-1)).

Upgrading to version 12.0.8 or 13.0.3 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 (111037). The entry 120428 is related to this item.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

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

NVD Base Score: 4.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

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: 111037
Nessus Name: openSUSE Security Update : nextcloud (openSUSE-2018-712)
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: Nextcloud Server 12.0.8/13.0.3

Timelineinfo

12/28/2017 🔍
06/21/2018 +175 days 🔍
07/05/2018 +13 days 🔍
07/05/2018 +0 days 🔍
07/05/2018 +0 days 🔍
07/11/2018 +6 days 🔍
07/12/2018 +1 days 🔍
02/25/2020 +593 days 🔍

Sourcesinfo

Advisory: nextcloud.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-3762 (🔍)
See also: 🔍

Entryinfo

Created: 07/05/2018 23:20
Updated: 02/25/2020 21:36
Changes: 07/05/2018 23:20 (74), 02/25/2020 21:36 (3)
Complete: 🔍

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