Trend Micro has patched six vulnerabilities in its Apex One on-prem and software-as-a-service products, one of which has been exploited in the wild.
Background
On September 2, Trend Micro released an advisory for several vulnerabilities in its Apex One and Apex One software-as-a-service (SaaS) products which are used for agent-based threat detection and response.
| CVE | Description | CVSSv3 |
|---|---|---|
| CVE-2022-40139 | Improper validation vulnerability in rollback functionality component | 7.2 |
| CVE-2022-40140 | Source validation error vulnerability leading to denial of service | 5.5 |
| CVE-2022-40141 | Information disclosure vulnerability | 5.6 |
| CVE-2022-40142 | Agent link interpretation vulnerability leading to privilege escalation | 7.8 |
| CVE-2022-40143 | Link interpretation vulnerability leading to privilege escalation | 7.3 |
| CVE-2022-40144 | Login authentication bypass vulnerability | 8.2 |
There is a fairly robust history of Apex One zero days. A little over a year ago, Trend Micro disclosed reports of two other zero days: CVE-2021-36741, an arbitrary file upload vulnerability, and CVE-2021-36742, a local privilege escalation. The Cybersecurity and Infrastructure Security Agency lists six vulnerabilities in Apex One in its Catalog of Known Exploited Vulnerabilities (KEV).
| CVE | Description | CVSSv3 |
|---|---|---|
| CVE-2020-8467 | Remote code execution | 8.8 |
| CVE-2020-8468 | Content validation escape | 8.8 |
| CVE-2020-24557 | Privilege escalation | 7.8 |
| CVE-2020-8599 | Arbitrary file upload vulnerability | 9.8 |
| CVE-2021-36742 | Local privilege escalation (KEV lists as arbitrary file upload) | 7.8 |
| CVE-2021-36741 | Arbitrary file upload vulnerability | 8.8 |
Analysis
CVE-2022-40139 is an improper validation vulnerability in the “rollback” functionality which is used to revert Apex One agents to older versions. The vulnerability exists because Apex One agents are able download unverified components which could lead to code execution. While this vulnerability can only be exploited by an attacker with access to the Apex One administrative console, there have been reports of active exploitation.
It is also worth noting that other vulnerabilities patched in this release (and legacy vulnerabilities) could provide the administrative access required to exploit CVE-2022-40139. However, there is no indication that the other CVEs patched in this release have been exploited, yet.
Solution
The specific versions to resolve these vulnerabilities are listed below, though Trend Micro’s advisory notes that some of the vulnerabilities disclosed may have been patched in earlier releases for the SaaS product.
| Vulnerable Product | Updated version |
|---|---|
| Apex One 2019 for Windows On-Prem | Apex One SP1 (b11092/11088) |
| Apex One (SaaS) for Windows | August 2022 Monthly Patch(202208) |
Identifying affected systems
A list of Tenable plugins to identify these vulnerabilities can be found here.
Get more information
- Trend Micro Apex One September 2022 Security Bulletin
- Trend Micro Apex One July 2021 Security Bulletin
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