Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 4 |
CVE-ID | CVE-2021-41798 CVE-2021-41799 CVE-2021-41800 CVE-2021-41801 |
CWE-ID | CWE-79 CWE-400 CWE-284 CWE-264 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software Subscribe |
MediaWiki Web applications / CMS |
Vendor | MediaWiki.org |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
EUVDB-ID: #VU56980
Risk: Medium
CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2021-41798
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: Yes
DescriptionThe disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in Special:Search. A remote user can permanently 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMediaWiki: 1.30.0 - 1.36.1
External linkshttp://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
http://phabricator.wikimedia.org/T285515
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
EUVDB-ID: #VU56981
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-41799
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when processing ApiQueryBacklinks. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMediaWiki: 1.30.0 - 1.36.1
External linkshttp://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
http://phabricator.wikimedia.org/T290379
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU56982
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-41800
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions, related to PoolCounter and Special:Contributions section. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the application.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMediaWiki: 1.30.0 - 1.36.1
External linkshttp://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
http://phabricator.wikimedia.org/T284419
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU56983
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-41801
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass security checks.
The vulnerability exists due to application does not properly check permissions when executing jobs. A remote user can execute actions, such as global replacement of text in wiki articles even after their permissions have been revoked.
Install updates from vendor's website.
Vulnerable software versionsMediaWiki: 1.30.0 - 1.36.1
External linkshttp://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
http://phabricator.wikimedia.org/T279090
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.