Vulnerability Name:

CVE-2020-8259 (CCN-191773)

Assigned:2020-10-03
Published:2020-10-03
Updated:2022-09-27
Summary:Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.
CVSS v3 Severity:8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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): High
Availibility (A): None
7.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N)
6.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:5.5 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
5.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:M/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Multiple_Instances
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-522
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-8259

Source: XF
Type: UNKNOWN
nextcloud-cve20208259-sec-bypass(191773)

Source: MISC
Type: Exploit, Issue Tracking, Third Party Advisory
https://hackerone.com/reports/732431

Source: CCN
Type: NC-SA-2020-041
Improper integrity protection of server-side encryption keys

Source: MISC
Type: Broken Link, Vendor Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2020-041

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-8259

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 20.0.0)

    • Configuration CCN 1:
  • cpe:/a:nextcloud:nextcloud_server:19.0.1:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    nextcloud nextcloud server *
    nextcloud nextcloud server 19.0.1