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Dear subscribers,

We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those 
vulnerabilities. Feel free to join our bug bounty programs for OX App Suite, Dovecot and PowerDNS at YesWeHack.

This advisory has also been published at 
https://documentation.open-xchange.com/appsuite/security/advisories/html/2023/oxas-adv-2023-0007.html.

Yours sincerely,
  Martin Heiland, Open-Xchange GmbH



Internal reference: OXUIB-2599
Type: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))
Component: frontend
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite frontend 7.10.6-rev38
First fixed revision: OX App Suite frontend 7.10.6-rev39
Discovery date: 2023-10-18
Solution date: 2023-12-01
CVE: CVE-2023-41708
CVSS: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)

Details:
XSS using script code as module at app loader. References to the "app loader" functionality could contain redirects to 
unexpected locations.

Risk:
Attackers could forge app references that bypass existing safeguards to inject malicious script code. No publicly 
available exploits are known.

Solution:
Please deploy the provided updates and patch releases. References to apps are now controlled more strict to avoid 
relative references.



---



Internal reference: MWB-2366
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: backend
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite backend 7.10.6-rev55, OX App Suite backend 7.6.3-rev71, OX App Suite backend 8.19
First fixed revision: OX App Suite backend 7.10.6-rev56, OX App Suite backend 7.6.3-rev72, OX App Suite backend 8.20
Discovery date: 2023-11-02
Solution date: 2023-12-05
CVE: CVE-2023-41707
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Details:
Excessive resource usage through mail search regex. Processing of user-defined mail search expressions is not limited.

Risk:
Availability of OX App Suite could be reduced due to high processing load. No publicly available exploits are known.

Solution:
Please deploy the provided updates and patch releases. Processing time of mail search expressions now gets monitored, 
and the related request is terminated if a resource threshold is reached.




---



Internal reference: MWB-2367
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: backend
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite backend 7.10.6-rev55, OX App Suite backend 7.6.3-rev71, OX App Suite backend 8.19
First fixed revision: OX App Suite backend 7.10.6-rev56, OX App Suite backend 7.6.3-rev72, OX App Suite backend 8.20
Discovery date: 2023-11-02
Solution date: 2023-12-01
CVE: CVE-2023-41706
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Details:
Excessive resource usage through drive search regex. Processing time of drive search expressions now gets monitored, 
and the related request is terminated if a resource threshold is reached.

Risk:
Availability of OX App Suite could be reduced due to high processing load. No publicly available exploits are known.

Solution:
Please deploy the provided updates and patch releases. Processing of user-defined drive search expressions is not 
limited



---



Internal reference: MWB-2392
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: backend
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite backend 7.10.6-rev55, OX App Suite backend 7.6.3-rev71, OX App Suite backend 8.20
First fixed revision: OX App Suite backend 7.10.6-rev56, OX App Suite backend 7.6.3-rev72, OX App Suite backend 8.21
Discovery date: 2023-11-28
Solution date: 2023-12-06
CVE: CVE-2023-41705
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Details:
High resource consumption by manipulated DAV user-agent strings. Processing of user-defined DAV user-agent strings is 
not limited.

Risk:
Availability of OX App Suite could be reduced due to high processing load. No publicly available exploits are known.

Solution:
Please deploy the provided updates and patch releases. Processing time of DAV user-agents now gets monitored, and the 
related request is terminated if a resource threshold is reached.



---



Internal reference: MWB-2393
Type: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))
Component: backend
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite backend 7.10.6-rev55, OX App Suite backend 7.6.3-rev71, OX App Suite backend 8.20
First fixed revision: OX App Suite backend 7.10.6-rev56, OX App Suite backend 7.6.3-rev72, OX App Suite backend 8.21
Discovery date: 2023-11-28
Solution date: 2023-12-06
CVE: CVE-2023-41704
CVSS: 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L)

Details:
XSS at E-Mail using CSS CID replacement. Processing of CID references at E-Mail can be abused to inject malicious 
script code that passes the sanitization engine.

Risk:
Malicious script code could be injected to a users sessions when interacting with E-Mails. No publicly available 
exploits are known.

Solution:
Please deploy the provided updates and patch releases. CID handing has been improved and resulting content is checked 
for malicious content.



---



Internal reference: DOCS-4483
Type: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))
Component: office
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX App Suite office 7.10.6-rev9, OX App Suite office 8.19
First fixed revision: OX App Suite office 7.10.6-rev10, OX App Suite office 8.20
Discovery date: 2022-05-19
Solution date: 2022-05-23
CVE: CVE-2023-41703
CVSS: 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

Details:
UserIds of mentions are not saved correctly after editing a comment with mentions. User ID references at mentions in 
document comments were not correctly sanitized.

Risk:
Script code could be injected to a users session when working with a malicious document. No publicly available exploits 
are known.

Solution:
Please deploy the provided updates and patch releases. User-defined content like comments and mentions are now filtered 
to avoid potentially malicious content.

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• OXAS-ADV-2023-0007: OX App Suite Security Advisory Martin Heiland via Fulldisclosure (Feb 13)