CVE-2023-20835 — In camsys, there is a possible use after free due to a race condition

In camsys, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07341261; Issue ID: ALPS07326570.

01What is this vulnerability?

In camsys, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07341261; Issue ID: ALPS07326570.

02Affected products

Vendor	Product	Versions
MediaTek, Inc.	MT6895, MT6983, MT8188, MT8195, MT8395, MT8781	Android 12.0, 13.0 / IOT-v23.0 (Yocto 4.0)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-09-04T02:27:40.600Z
• Last modified: 2024-10-21T16:59:12.216Z

09References

• corp.mediatek.com — https://corp.mediatek.com/product-security-bulletin/September-2023