Android Kernel Use-After-Free
CVE-2019-2215 is a high-severity use after free vulnerability in Android, 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 Android versions: Kernel. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on November 3, 2021, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Alp-al00b Firmware to 10.0.0.162\(c00e156r2p4\) or a later version.
- Update Alp-tl00b Firmware to 10.0.0.162\(c01e156r1p4\) or a later version.
- Update Anne-al00 Firmware to 9.1.0.126\(c00e126r1p7t8\) or a later version.
- CISA's required action: Apply updates per vendor instructions.
- Read the advisory on packetstormsecurity.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Android | Android | Kernel | Not stated |
| Debian | Debian Linux | 8.0 | Not stated |
| Canonical | Ubuntu Linux | 16.04 | Not stated |
| NetApp | Cloud Backup | Not specified in the record | Not stated |
| NetApp | Data Availability Services | Not specified in the record | Not stated |
| NetApp | Hci Management Node | Not specified in the record | Not stated |
| NetApp | Service Processor | Not specified in the record | Not stated |
| NetApp | Solidfire | Not specified in the record | Not stated |
| NetApp | Steelstore Cloud Integrated Storage | Not specified in the record | Not stated |
| NetApp | Solidfire Baseboard Management Controller Firmware | Not specified in the record | Not stated |
| NetApp | Aff Baseboard Management Controller Firmware | Not specified in the record | Not stated |
| NetApp | A320 Firmware | Not specified in the record | Not stated |
| NetApp | C190 Firmware | Not specified in the record | Not stated |
| NetApp | A220 Firmware | Not specified in the record | Not stated |
| NetApp | Fas2720 Firmware | Not specified in the record | Not stated |
| NetApp | Fas2750 Firmware | Not specified in the record | Not stated |
| NetApp | A800 Firmware | Not specified in the record | Not stated |
| NetApp | H300s Firmware | Not specified in the record | Not stated |
| NetApp | H500s Firmware | Not specified in the record | Not stated |
| NetApp | H700s Firmware | Not specified in the record | Not stated |
| NetApp | H410s Firmware | Not specified in the record | Not stated |
| NetApp | H410c Firmware | Not specified in the record | Not stated |
| NetApp | H610s Firmware | Not specified in the record | Not stated |
| Huawei | Alp-al00b Firmware | before 10.0.0.162\(c00e156r2p4\) | 10.0.0.162\(c00e156r2p4\) |
| Huawei | Alp-tl00b Firmware | before 10.0.0.162\(c01e156r1p4\) | 10.0.0.162\(c01e156r1p4\) |
Version data comes from the organisation that assigned the CVE; 35 further products are omitted here. 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 | 7.8 | High | NVD |
| CVSS 3.1 | 7.8 | High | CISA (ADP) |
| CVSS 2.0 | 4.6 | Medium | NVD |
Official description
A use-after-free in binder.c allows an elevation of privilege from an application to the Linux Kernel. No user interaction is required to exploit this vulnerability, however exploitation does require either the installation of a malicious local application or a separate vulnerability in a network facing application.Product: AndroidAndroid ID: A-141720095
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.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Patches and release notes
- seclists.org/bugtraq/2019/Nov/11Mailing List, Third Party Advisory
Third-party and government advisories
- seclists.org/fulldisclosure/2019/Oct/38Mailing List, Third Party Advisory
- lists.debian.org/debian-lts-announce/2020/01/msg00013.htmlMailing List, Third Party Advisory
- lists.debian.org/debian-lts-announce/2020/03/msg00001.htmlMailing List, Third Party Advisory
- security.netapp.com/advisory/ntap-20191031-0005/Third Party Advisory
- usn.ubuntu.com/4186-1/Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-2215US Government Resource
Technical write-ups (may include proof of concept)
- packetstormsecurity.com/files/154911/Android-Binder-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
- packetstormsecurity.com/files/156495/Android-Binder-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
Other vulnerabilities in Android
- 5.5 Medium severity
Android Pixel Information Disclosure Exploited
- 7.5 High severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
Recent Use After Free vulnerabilities
- 6.5 Medium severity
Google Chrome Blink Use-After-Free Exploited
- 9.8 Critical severity
- 7.8 High severity
Apache HTTP Server Privilege Escalation Exploited
- 7.8 High severity
Adobe Flash Player Use-After-Free Exploited
- 7.5 High severity
- 7.8 High severity
Adobe Flash Player Use-After-Free Exploited
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