Nextcloud Server up to 12.0.7/13.0.2 OAuth2 key management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Nextcloud Server up to 12.0.7/13.0.2. Affected by this vulnerability is an unknown functionality of the component OAuth2. Such manipulation leads to key management. This vulnerability is listed as CVE-2018-3761. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Nextcloud Server up to 12.0.7/13.0.2 (Cloud Software). It has been rated as critical. Affected by this issue is an unknown function of the component OAuth2. The manipulation with an unknown input leads to a key management vulnerability. Using CWE to declare the problem leads to CWE-320. Impacted is confidentiality, and integrity. CVE summarizes:

Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.

The bug was discovered 06/21/2018. The weakness was presented 07/05/2018 (Website). The advisory is shared for download at nextcloud.com. This vulnerability is handled as CVE-2018-3761 since 12/28/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

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). See VDB-120429 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 7.9

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
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: Key management
CWE: CWE-320
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
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-2018-3761 (🔍)
GCVE (CVE): GCVE-0-2018-3761
GCVE (VulDB): GCVE-100-120428
See also: 🔍

Entryinfo

Created: 07/05/2018 23:19
Updated: 02/25/2020 21:31
Changes: 07/05/2018 23:19 (72), 02/25/2020 21:31 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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