CVE-2025-20900

Vulnerability

An out-of-bounds write vulnerability exists in Samsung Blockchain Keystore prior to version 1.3.16.5 [1]. The flaw allows a local privileged attacker to write beyond allocated memory boundaries, potentially corrupting adjacent memory regions. All versions before 1.3.16.5 are affected.

Exploitation

To exploit this vulnerability, an attacker must have local access to the device and elevated privileges. The exact exploitation steps are not detailed in the available reference [1], but the vulnerability is classified as a local out-of-bounds write, meaning the attacker can trigger the flaw through a crafted input or operation within the Blockchain Keystore application.

Impact

Successful exploitation allows the attacker to write out-of-bounds memory, which can lead to memory corruption. This could result in a denial of service, escalation of privileges, or arbitrary code execution within the context of the affected service. The compromise could affect the integrity and availability of the system.

Mitigation

The vulnerability is fixed in Blockchain Keystore version 1.3.16.5 [1]. Users should update their Samsung devices to the latest security patch level, which includes the fix for this vulnerability. No workarounds have been published.