#VU77990 Use-after-free in Google Android - CVE-2023-21255

Vulnerability identifier: #VU77990

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-21255

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Google Android
Operating systems & Components / Operating system

Vendor: Google

Description

The vulnerability allows a local application to escalate privileges on the system.

The vulnerability exists due to insufficient validation of user-supplied input within the binder_transaction_buffer_release() function in Binder subsystem in Android kernel. A local application can trigger a use-after-fee error and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Google Android: before 11, 12L, 12, 13, 11

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External links
https://source.android.com/docs/security/bulletin/2023-07-01
https://android.googlesource.com/kernel/common/+/1ca1130ec62d

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.