CVE-2023-20840 — In imgsys, there is a possible out of bounds read and write due to a missing val

In imgsys, there is a possible out of bounds read and write due to a missing valid range checking. This could lead to local escalation of privilege with System execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS07326430; Issue ID: ALPS07326430

01What is this vulnerability?

In imgsys, there is a possible out of bounds read and write due to a missing valid range checking. This could lead to local escalation of privilege with System execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS07326430; Issue ID: ALPS07326430.

02Affected products

Vendor	Product	Versions
MediaTek, Inc.	MT6895, MT6897, MT6983, MT8188, MT8195, MT8395	Android 11.0, 12.0 / Linux 6.1 / 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: 2023-09-04T02:27:48.606Z
• Last modified: 2024-10-21T17:21:58.898Z

09References

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