Multiple vulnerabilities in Nextcloud Server
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2021-32801 CVE-2021-32766 CVE-2021-32800 CVE-2021-32802 |
| CWE-ID | CWE-532 CWE-200 CWE-287 CWE-829 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Nextcloud Server Client/Desktop applications / Messaging software |
| Vendor | Nextcloud |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Inclusion of Sensitive Information in Log Files
EUVDB-ID: #VU56362
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-32801
CWE-ID:
CWE-532 - Information Exposure Through Log Files
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to software stores sensitive information into log files. A remote attacker can read the log files and gain access to sensitive data.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Server: 20.0.0 - 21.0.3
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-mcpf-v65v-359h/
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.
2) Information disclosure
EUVDB-ID: #VU56366
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-32766
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output within the Nextcloud Text application. A remote attacker can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Server: 20.0.0 - 21.0.3
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3wmc-88jr/
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.
3) Improper Authentication
EUVDB-ID: #VU56365
Risk: Medium
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-32800
CWE-ID:
CWE-287 - Improper Authentication
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests. A remote authenticated attacker can bypass Two Factor Authentication and gain access to an account.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Server: 20.0.0 - 21.0.3
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-gv5w-8q25-785v/
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.
4) Inclusion of Functionality from Untrusted Control Sphere
EUVDB-ID: #VU56363
Risk: High
CVSSv3.1: 8.5 [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]
CVE-ID: CVE-2021-32802
CWE-ID:
CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to preview generation used third-party library not suited for user-generated content. A remote attacker can execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNextcloud Server: 20.0.0 - 21.0.3
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7/
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.
