Vulnerability Name:

CVE-2020-8293 (CCN-195672)

Assigned:2020-11-18
Published:2020-11-18
Updated:2022-09-27
Summary:A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/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): None
Availibility (A): High
5.7 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H)
5.0 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-400
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-8293

Source: XF
Type: UNKNOWN
nextcloud-cve20208293-dos(195672)

Source: MISC
Type: Third Party Advisory
https://hackerone.com/reports/1018146

Source: CCN
Type: NC-SA-2021-001
Potential DDoS when posting long data into workflow validation rules

Source: MISC
Type: Broken Link, Vendor Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2021-001

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-8293

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 20.0.0 and < 20.0.2)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 19.0.0 and < 19.0.5)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 18.0.11)

    • Configuration CCN 1:
  • cpe:/a:nextcloud:nextcloud_server:18.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:19.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:20.0.0:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:93630
    P
    		 (Important)
    2022-07-21
    oval:org.opensuse.security:def:100343
    P
    		 (Important)
    2021-10-26
    oval:org.opensuse.security:def:110978
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:103101
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:35508
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:96411
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:111486
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:11104
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:109758
    P
    		Security update for nextcloud (Important)
    2021-07-20
    oval:org.opensuse.security:def:11176
    P
    		Security update for nextcloud (Moderate)
    2021-02-11
    oval:org.opensuse.security:def:109792
    P
    		Security update for nextcloud (Moderate)
    2021-02-11
    oval:org.opensuse.security:def:103135
    P
    		Security update for nextcloud (Moderate)
    2021-02-11
    oval:org.opensuse.security:def:96445
    P
    		Security update for nextcloud (Moderate)
    2021-02-11
    oval:org.opensuse.security:def:111211
    P
    		Security update for nextcloud (Moderate)
    2021-02-08
    BACK
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server 18.0.0 -
    nextcloud nextcloud server 19.0.0 -
    nextcloud nextcloud server 20.0.0