SB2019112808 - Multiple vulnerabilities in GitLab Community and Enterprise Edition

Description

This security bulletin contains information about 18 vulnerabilities.

1) Improper Authorization (CVE-ID: CVE-2019-18459)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows an attacker to bypass authorization checks.

The vulnerability exists due to improper authorization checks in the protected environments feature. A remote attacker can gain access to protected environments even after removal.

2) Information disclosure (CVE-ID: CVE-2019-18456)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to insecure permissions in the Search feature provided by Elasticsearch integration. A remote attacker can disclose private comments in restricted groups.

3) Improper access control (CVE-ID: CVE-2019-18453)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote demoted user can bypass implemented security restrictions and add comments via email.

4) Incorrect permission assignment for critical resource (CVE-ID: CVE-2019-18446)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain access to otherwise restricted functionality.

The vulnerability exists due to insecure permissions. A remote authenticated attacker can delete the source branch of MR.

5) Incorrect permission assignment for critical resource (CVE-ID: CVE-2019-18447)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain access to potentially sensitive information on the target system.

The vulnerability exists due to insecure permissions. A remote authenticated attacker can view the members of a private group.

6) Information disclosure (CVE-ID: CVE-2019-18449)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to insecure permissions in the autocomplete feature. A remote unauthorised user can read private groups membership.

7) Information disclosure (CVE-ID: CVE-2019-18462)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to insecure permissions. A remote unauthorised user can confirm the name of a private repository.

8) Information disclosure (CVE-ID: CVE-2019-18463)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to insecure permissions. A remote unauthorised user can list the packages of a group.

9) Improper access control (CVE-ID: CVE-2019-18461)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to improper access restrictions. A remote attacker can disclose the private sub group path when a sub group epic is added to a public group.

10) Information disclosure (CVE-ID: CVE-2019-18460)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to improper access control in the Comments Search feature provided by the Elasticsearch integration. A remote attacker can gain unauthorized access to sensitive information on the system.

11) Stored cross-site scripting (CVE-ID: CVE-2019-18454)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in link validation for RDoc wiki pages feature. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

12) Improper Authorization (CVE-ID: CVE-2019-18458)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows an attacker to bypass authorization checks.

The vulnerability exists due to improper authorization checks for transfer projects to another group feature. A remote user with developer rights can move projects.

13) Improper Authorization (CVE-ID: CVE-2019-18457)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows an attacker to bypass authorization checks.

The vulnerability exists due to improper authorization checks in the Sentry tokens handling. A demoted user can gain access to the affected system.

14) Infinite loop (CVE-ID: CVE-2019-18455)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop when building Nested GraphQL queries. A remote attacker can consume all available system resources and cause denial of service conditions.

15) Information disclosure (CVE-ID: CVE-2019-18448)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to improper access restrictions. A remote authenticated attacker can perform brute-force attack and check if a private repository exists.

16) Incorrect permission assignment for critical resource (CVE-ID: CVE-2019-18450)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain access to potentially sensitive information on the target system.

The vulnerability exists due to insecure permissions in the Project labels feature. A remote authenticated attacker can disclose the project labels through the GitLab API.

17) Open redirect (CVE-ID: CVE-2019-18451)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in the InternalRedirect filtering feature. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

18) Incorrect permission assignment for critical resource (CVE-ID: CVE-2019-18452)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information on the target system.

The vulnerability exists due to insecure permissions when moving an issue to a public project from a private one. A remote attacker can disclose the associated private labels and the private project namespace through the GitLab API.

Remediation

Install update from vendor's website.

References

• https://about.gitlab.com/blog/2019/10/30/security-release-gitlab-12-dot-4-dot-1-released/
• https://about.gitlab.com/blog/categories/releases/