Firmware code execution via bitmap size overflow
Published May 23, 2023 · Updated Jan 21, 2025
Integer overflow in Garmin Connect IQ API 2.3.0 through 4.1.7 allows attackers to execute code in device firmware through a malicious application. Toybox.Graphics.BufferedBitmap.initialize multiplies attacker-controlled width, height, palette, and color-depth values without overflow checks, then allocates a buffer from the wrapped size. Execution requires a malicious Connect IQ application on a compatible Garmin device; the published proof of concept demonstrates a device crash, while the CVE record reports firmware control.
Summary
What happened
Integer overflow in Garmin Connect IQ API 2.3.0 through 4.1.7 allows attackers to execute code in device firmware through a malicious application. Toybox.Graphics.BufferedBitmap.initialize multiplies attacker-controlled width, height, palette, and color-depth values without overflow checks, then allocates a buffer from the wrapped size. Execution requires a malicious Connect IQ application on a compatible Garmin device; the published proof of concept demonstrates a device crash, while the CVE record reports firmware control.
The record
- CVE
- CVE-2023-23298
- Published
- May 23, 2023
- Updated
- Jan 21, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 23, 2023CVE publishedPublication date reported by the CVE source.
- Jan 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GRMN-04.prg proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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