Vulnerability Name:

CVE-2020-8139 (CCN-178302)

Assigned:2020-02-07
Published:2020-02-07
Updated:2022-06-04
Summary:A missing access control check in Nextcloud Server < 18.0.1, < 17.0.4, and < 16.0.9 causes hide-download shares to be downloadable when appending /download to the URL.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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): High
Integrity (I): None
Availibility (A): None
4.3 Medium (CCN 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 (CCN 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
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
4.0 Medium (CCN 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
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-862
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-8139

Source: XF
Type: UNKNOWN
nextcloud-cve20208139-sec-bypass(178302)

Source: MISC
Type: Permissions Required
https://hackerone.com/reports/788257

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-c9863904de

Source: CCN
Type: NC-SA-2020-015
Secure view shares can be downloaded by manipulating the URL

Source: CONFIRM
Type: Vendor Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2020-015

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 17.0.0 and < 17.0.4)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 16.0.0 and < 16.0.9)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 18.0.0 and < 18.0.1)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:nextcloud:nextcloud_server:18.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:17.0.3:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:16.0.8:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    fedoraproject fedora 32
    nextcloud nextcloud server 18.0.0 -
    nextcloud nextcloud server 17.0.3 -
    nextcloud nextcloud server 16.0.8 -