| Vulnerability Name: | CVE-2021-32802 (CCN-208907) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assigned: | 2021-09-06 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Published: | 2021-09-06 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: | 2022-09-27 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary: | Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn't suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| CVSS v3 Severity: | 9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) 8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
8.2 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||
| CVSS v2 Severity: | 10.0 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Vulnerability Type: | CWE-829 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Vulnerability Consequences: | Gain Access | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| References: | Source: MITRE Type: CNA CVE-2021-32802 Source: MISC Type: Vendor Advisory https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews Source: XF Type: UNKNOWN nextcloud-cve202132802-code-exec(208907) Source: CCN Type: Nextcloud GIT Repository Preview generation used third-party library not suited for user-generated content Source: CONFIRM Type: Mitigation, Third Party Advisory https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7 Source: MISC Type: Permissions Required, Third Party Advisory https://hackerone.com/reports/1261413 Source: GENTOO Type: Third Party Advisory GLSA-202208-17 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Vulnerable Configuration: | Configuration 1: Configuration CCN 1:  Denotes that component is vulnerable | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Oval Definitions | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||
| BACK | |||||||||||||||||||||||||||||||||||||||||||||||||||||