Vulnerability Name:

CVE-2020-27621 (CCN-190411)

Assigned:2020-10-18
Published:2020-10-18
Updated:2020-11-02
Summary:The FileImporter extension in MediaWiki through 1.35.0 was not properly attributing various user actions to a specific user's IP address. Instead, for various actions, it would report the IP address of an internal Wikimedia Foundation server by omitting X-Forwarded-For data. This resulted in an inability to properly audit and attribute various user actions performed via the FileImporter extension.
CVSS v3 Severity:4.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
3.8 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: 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)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
6.4 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-Other
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2020-27621

Source: XF
Type: UNKNOWN
mediawiki-cve202027621-weak-security(190411)

Source: CCN
Type: MediaWiki Web site
Set originalRequest (incl. X-Forwarded-For) for remote edits

Source: MISC
Type: Exploit, Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/I24a240253c7a5c66dd493a68e8c23d95a17e1b21

Source: CCN
Type: Phabricator Web page
mw-ext-FileImporter uses a WMF IP address, does not include XFF for users using this extension (CVE-2020-27621)

Source: MISC
Type: Exploit, Patch, Vendor Advisory
https://phabricator.wikimedia.org/T265810

Vulnerable Configuration:Configuration 1:
  • cpe:/a:mediawiki:mediawiki:*:*:*:*:*:*:*:* (Version <= 1.35.0)

    • * Denotes that component is vulnerable
    BACK
    mediawiki mediawiki *