GitHub_MCVELIST:CVE-2023-35927CVE-2023-35927 Nextcloud system addressbooks can be modified by malicious trusted server
7.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
8 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
49.7%
NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again.
Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. Remove all trusted servers in the “Administration” > “Sharing” settings …/index.php/settings/admin/sharing. Afterwards, trigger a recreation of the local system addressbook with the following occ dav:sync-system-addressbook.
CNA Affected
[
{
"vendor": "nextcloud",
"product": "security-advisories",
"versions": [
{
"version": "Nextcloud Server >= 25.0.0, < 25.0.7",
"status": "affected"
},
{
"version": "Nextcloud Server >= 26.0.0, < 26.0.2",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 25.0.0, < 25.0.7",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 26.0.0, < 26.0.2",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 22.0.0, < 22.2.10.12",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 23.0.0, < 23.0.12.7",
"status": "affected"
},
{
"version": "Nextcloud Enterprise Server >= 24.0.0, < 24.0.12.2",
"status": "affected"
}
]
}
]Related
7.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
8 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
49.7%