Vulnerability Name:

CVE-2019-15621 (CCN-175787)

Assigned:2019-06-27
Published:2019-06-27
Updated:2020-02-16
Summary:Improper permissions preservation in Nextcloud Server 16.0.1 causes sharees to be able to reshare with write permissions when sharing the mount point of a share they received, as a public link.
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:H/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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): None
Integrity (I): High
Availibility (A): None
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:4.0 Medium (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
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
8.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-281
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-15621

Source: SUSE
Type: UNKNOWN
openSUSE-SU-2020:0220

Source: SUSE
Type: UNKNOWN
openSUSE-SU-2020:0229

Source: XF
Type: UNKNOWN
nextcloud-cve201915621-sec-bypass(175787)

Source: MISC
Type: Permissions Required
https://hackerone.com/reports/619484

Source: CCN
Type: NC-SA-2020-012
Improper permission preservation on reshares

Source: MISC
Type: Vendor Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2020-012

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-15621

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version < 14.0.13)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 15.0.0 and < 15.0.9)
  • OR cpe:/a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* (Version >= 16.0.0 and < 16.0.2)

    • Configuration CCN 1:
  • cpe:/a:nextcloud:nextcloud_server:15.0.8:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:16.0.1:-:*:*:*:*:*:*
  • OR cpe:/a:nextcloud:nextcloud_server:14.0.12:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:201915621
    V
    		CVE-2019-15621
    2021-10-24
    oval:org.opensuse.security:def:63230
    P
    		postgresql-contrib-10-6.8 on GA media (Moderate)
    2021-09-21
    oval:org.opensuse.security:def:74729
    P
    		Security update for go1.16 (Moderate)
    2021-08-20
    oval:org.opensuse.security:def:63433
    P
    		liblcms2-2-32bit-2.9-3.3.1 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:62734
    P
    		bluez-devel-5.55-1.57 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62727
    P
    		ImageMagick-7.0.7.34-10.15.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62759
    P
    		hplip-3.20.11-2.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62731
    P
    		accountsservice-0.6.55-3.14 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:93567
    P
    		 (Important)
    2021-06-08
    oval:org.opensuse.security:def:100273
    P
    		 (Important)
    2021-04-30
    oval:org.opensuse.security:def:64484
    P
    		Security update for samba (Important)
    2021-04-29
    oval:org.opensuse.security:def:93560
    P
    		 (Important)
    2021-04-01
    oval:org.opensuse.security:def:64654
    P
    		Security update for avahi (Moderate)
    2021-02-23
    oval:org.opensuse.security:def:64542
    P
    		Security update for sudo (Important)
    2021-01-26
    oval:org.opensuse.security:def:100280
    P
    		 (Important)
    2021-01-20
    oval:org.opensuse.security:def:64275
    P
    		Security update for curl (Moderate)
    2020-12-09
    oval:org.opensuse.security:def:64274
    P
    		Security update for python-urllib3 (Moderate)
    2020-12-09
    oval:org.opensuse.security:def:63580
    P
    		icedtea-web-1.7.1-5.13 on GA media (Moderate)
    2020-12-03
    oval:org.opensuse.security:def:62937
    P
    		bsdtar-3.4.2-2.24 on GA media (Moderate)
    2020-12-03
    oval:org.opensuse.security:def:25679
    P
    		Security update for tcpdump (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25061
    P
    		Security update for libseccomp (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25767
    P
    		Security update for DirectFB (Important)
    2020-12-01
    oval:org.opensuse.security:def:64138
    P
    		Security update for xorg-x11-server (Important)
    2020-12-01
    oval:org.opensuse.security:def:25253
    P
    		Security update for tomcat (Important)
    2020-12-01
    oval:org.opensuse.security:def:25825
    P
    		Security update for ImageMagick (Important)
    2020-12-01
    oval:org.opensuse.security:def:25391
    P
    		Security update for ovmf (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:26498
    P
    		Security update for nextcloud (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25626
    P
    		Security update for libqt5-qtbase (Important)
    2020-12-01
    oval:org.opensuse.security:def:25050
    P
    		Security update for nfs-utils (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:74596
    P
    		Security update for perl-DBI (Important)
    2020-12-01
    oval:org.opensuse.security:def:64382
    P
    		libsmi on GA media (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:63809
    P
    		Security update for accountsservice (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25125
    P
    		Security update for the Linux Kernel (Important)
    2020-12-01
    oval:org.opensuse.security:def:25049
    P
    		Security update for accountsservice (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25781
    P
    		Security update for libqt4 (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25334
    P
    		Security update for java-1_8_0-openjdk (Important)
    2020-12-01
    oval:org.opensuse.security:def:26463
    P
    		Security update for enigmail (Moderate)
    2020-12-01
    oval:org.opensuse.security:def:25475
    P
    		Security update for libssh (Important)
    2020-12-01
    oval:org.opensuse.security:def:110366
    P
    		Security update for nextcloud (Moderate)
    2020-02-15
    BACK
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server *
    nextcloud nextcloud server 15.0.8
    nextcloud nextcloud server 16.0.1
    nextcloud nextcloud server 14.0.12