exynos_850: Use After Free
CVE-2024-32503 is a high-severity use after free vulnerability in exynos_850 from Samsung, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. Affected exynos_850 versions: all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of exynos_850 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on semiconductor.samsung.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Samsung | exynos_850 | all versions | Not stated |
| Samsung | exynos_1080 | all versions | Not stated |
| Samsung | exynos_1280 | all versions | Not stated |
| Samsung | exynos_1380 | all versions | Not stated |
| Samsung | exynos_1330 | all versions | Not stated |
| Samsung | exynos_w920 | all versions | Not stated |
| Samsung | exynos_2100 | all versions | Not stated |
| Samsung | exynos_w930 | all versions | Not stated |
| Samsung | Exynos 850 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos 1080 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos 2100 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos 1280 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos 1380 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos 1330 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos W920 Firmware | Not specified in the record | Not stated |
| Samsung | Exynos W930 Firmware | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.4 | High | CNA (mitre.org) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
An issue was discovered in Samsung Mobile Processor and Wearable Processor Exynos 850, Exynos 1080, Exynos 2100, Exynos 1280, Exynos 1380, Exynos 1330, Exynos W920, Exynos W930. The mobile processor lacks proper memory deallocation checking, which can result in a UAF (Use-After-Free) vulnerability.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
How developers prevent this class of flaw
- Choose a language that provides automatic memory management.
- When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in exynos_850
- 8.4 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
Recent Use After Free vulnerabilities
- 8.4 High severity
- 7.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
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