Medium severity · published Jun 20, 2023
CVE-2023-26433
When adding an external mail account, processing of IMAP "capabilities" responses are not limited to plausible sizes
4.3
CVSS
1.1%
EPSS
No
On KEV
Description
When adding an external mail account, processing of IMAP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 67% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OA
Open-xchange Appsuite Backend · Open-xchange
before 7.10.6; 8.0.0 before 8.11.0; 7.10.6; 7.10.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-26433
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-26433
Third Party Advisory
http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html
Mailing List
http://seclists.org/fulldisclosure/2023/Jun/8
documentation.open-xchange.com
https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
Release Notes
https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
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