13 vulnerabilities disclosed in U-Boot loader

News by Doug Olenick

Vulnerabilities in U-Boot loader enables an attacker in the same network to execute code on the device

The code analysis platform provider Semmle has publicly disclosed 13 vulnerabilities in the open-source universal boot loader Das U-Boot.

The issues, which can lead to remote code execution, are exploitable when U-Boot is configured to use networking and NFS, said Semmle CSO Fermín Sernawho discovered the fault. He noted U-Boot can be found in this state during development or under diskless configurations, but far less infrequently in "final consumer devices using U-Boot."

Semmle made the disclosure at the request of U-Boot maintainer Tom Rini and also issued a temporary, but not fully tested, patch.

The vulnerabilities in question are covered under: CVE-2019-14192, CVE-2019-14193, CVE-2019-14194, CVE-2019-14195, CVE-2019-14196, CVE-2019-14197, CVE-2019-14198, CVE-2019-14199, CVE-2019-14200, CVE-2019-14201, CVE-2019-14202, CVE-2019-14203 and CVE-2019-14204.

"Through these vulnerabilities, an attacker in the same network (or controlling a malicious NFS server) could execute code on the U-Boot powered device. Due to the nature of this vulnerability, exploitation does not seem extremely complicated, although it could be made more challenging by using stack cookies, ASLR, or other memory protection runtime and compile time mitigations," Serna said.

The issue was discovered on 15 May, 2019. Semmle contacted U-Boot maintainers on 23 May after the investigation concluded and received a confirmation from Rini the following day. Public disclosure took place on 22 July.

This article was originally published on SC Media US.

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