GitHub Community Edition/Enterprise Edition 13.0 Bitbucket Server Import access control

EntryeditHistoryDiffjsonxmlCTI

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.
4.9	$0-$5k	0.00

A vulnerability was found in GitHub Community Edition and Enterprise Edition 13.0 (Bug Tracking Software) and classified as critical. Affected by this issue is some unknown processing of the component Bitbucket Server Import. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-284. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In all versions of GitLab CE/EE since version 13.0, an instance that has the setting to disable Bitbucket Server import enabled is bypassed by an attacker making a crafted API call.

The weakness was disclosed 10/05/2021 as 34078. The advisory is shared for download at gitlab.com. This vulnerability is handled as CVE-2021-39871 since 08/23/2021. The exploitation is known to be easy. Access to the local network is required for this attack to succeed. Required for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/09/2021). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfoedit

Type

Bug Tracking Software

Vendor

GitHub

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (GitLab Inc.): 🔒

CVSSv2infoedit

AV	AC	Au	C	I	A
🔍	🔍	🔍	🔍	🔍	🔍
🔍	🔍	🔍	🔍	🔍	🔍
🔍	🔍	🔍	🔍	🔍	🔍

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

08/23/2021 CVE reserved
10/05/2021 +43 days Advisory disclosed
10/05/2021 +0 days VulDB entry created
10/09/2021 +4 days VulDB last update

Sourcesinfoedit

Advisory: 34078
Status: Not defined
Confirmation: 🔒

CVE: CVE-2021-39871 (🔒)

Entryinfoedit

Created: 10/05/2021 09:44 AM
Updated: 10/09/2021 06:54 AM
Changes: (12) vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore source_cve_cna vulnerability_cvss3_cna_basescore vulnerability_cvss3_cna_av vulnerability_cvss3_cna_ac vulnerability_cvss3_cna_pr vulnerability_cvss3_cna_ui vulnerability_cvss3_cna_s vulnerability_cvss3_cna_c vulnerability_cvss3_cna_i vulnerability_cvss3_cna_a
Complete: 🔍