Vulnerability · Published Nov 15, 2021 · Assigned by zdi

CVE-2021-34992

High 8.8

In plain English

A high-severity unsafe deserialization in C1 CMS from Orckestra. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.3% (higher than 91% of all known vulnerabilities).

Severity (CVSS 3.0)8.8High

Exploit odds (30 days)4.3%top 8.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Orckestra C1 CMS 6.10. Authentication is required to exploit this vulnerability. The specific flaw exists within Composite.dll. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-14740.

Affected products (as reported)

Vendor	Product	Versions
Orckestra	C1 CMS	6.10

Weakness: CWE-502 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://www.zerodayinitiative.com/advisories/ZDI-21-1304/ x_refsource_MISC
https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11 x_refsource_MISC