This is the documentation for the latest (master) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Vulnerabilities

This page collects all of the vulnerabilities that are discovered and fixed in each release. It will also often have more details than is available in the releases. Some vulnerabilities are deemed to be sensitive, and will not be publically discussed until there is sufficient time to fix them. Because the release notes are locked to a version, the information here can be updated after the embargo is lifted.

CVE-2017

CVE-2017-14199

Buffer overflow in getaddrinfo().

CVE-2017-14201

The shell DNS command can cause unpredictable results due to misuse of stack variables.

Use After Free vulnerability in the Zephyr shell allows a serial or telnet connected user to cause denial of service, and possibly remote code execution.

This has been fixed in release v1.14.0.

CVE-2017-14202

The shell implementation does not protect against buffer overruns resulting in unpredicable behavior.

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in the shell component of Zephyr allows a serial or telnet connected user to cause a crash, possibly with arbitrary code execution.

This has been fixed in release v1.14.0.

CVE-2019

CVE-2019-9506

The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka “KNOB”) that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.

CVE-2020

CVE-2020-10019

Buffer Overflow vulnerability in USB DFU of zephyr allows a USB connected host to cause possible remote code execution.

This has been fixed in releases v1.14.2, v2.2.0, and v2.1.1.

CVE-2020-10021

Out-of-bounds write in USB Mass Storage with unaligned sizes

Out-of-bounds Write in the USB Mass Storage memoryWrite handler with unaligned Sizes.

See NCC-ZEP-024, NCC-ZEP-025, NCC-ZEP-026

This has been fixed in releases v1.14.2, and v2.2.0.

CVE-2020-10022

UpdateHub Module Copies a Variable-Size Hash String Into a Fixed-Size Array

A malformed JSON payload that is received from an UpdateHub server may trigger memory corruption in the Zephyr OS. This could result in a denial of service in the best case, or code execution in the worst case.

See NCC-ZEP-016

This has been fixed in the below pull requests for master, branch from v2.1.0, and branch from v2.2.0.

CVE-2020-10023

Shell Subsystem Contains a Buffer Overflow Vulnerability In shell_spaces_trim

The shell subsystem contains a buffer overflow, whereby an adversary with physical access to the device is able to cause a memory corruption, resulting in denial of service or possibly code execution within the Zephyr kernel.

See NCC-ZEP-019

This has been fixed in releases v1.14.2, v2.2.0, and in a branch from v2.1.0,

CVE-2020-10024

ARM Platform Uses Signed Integer Comparison When Validating Syscall Numbers

The arm platform-specific code uses a signed integer comparison when validating system call numbers. An attacker who has obtained code execution within a user thread is able to elevate privileges to that of the kernel.

See NCC-ZEP-001

This has been fixed in releases v1.14.2, and v2.2.0, and in a branch from v2.1.0,

CVE-2020-10027

ARC Platform Uses Signed Integer Comparison When Validating Syscall Numbers

An attacker who has obtained code execution within a user thread is able to elevate privileges to that of the kernel.

See NCC-ZEP-001

This has been fixed in releases v1.14.2, and v2.2.0, and in a branch from v2.1.0.

CVE-2020-10028

Multiple Syscalls In GPIO Subsystem Performs No Argument Validation

Multiple syscalls with insufficient argument validation

See NCC-ZEP-006

This has been fixed in releases v1.14.2, and v2.2.0, and in a branch from v2.1.0.

CVE-2020-10058

Multiple Syscalls In kscan Subsystem Performs No Argument Validation

Multiple syscalls in the Kscan subsystem perform insufficient argument validation, allowing code executing in userspace to potentially gain elevated privileges.

See NCC-ZEP-006

This has been fixed in a branch from v2.1.0, and release v2.2.0.

CVE-2020-10059

UpdateHub Module Explicitly Disables TLS Verification

The UpdateHub module disables DTLS peer checking, which allows for a man in the middle attack. This is mitigated by firmware images requiring valid signatures. However, there is no benefit to using DTLS without the peer checking.

See NCC-ZEP-018

This has been fixed in a PR against Zephyr master.

CVE-2020-10060

UpdateHub Might Dereference An Uninitialized Pointer

In updatehub_probe, right after JSON parsing is complete, objects[1] is accessed from the output structure in two different places. If the JSON contained less than two elements, this access would reference unitialized stack memory. This could result in a crash, denial of service, or possibly an information leak.

Recommend disabling updatehub until such a time as a fix can be made available.

See NCC-ZEP-030

This issue has not been fixed.

CVE-2020-10061

Error handling invalid packet sequence

Improper handling of the full-buffer case in the Zephyr Bluetooth implementation can result in memory corruption.

This has been fixed in branches for v1.14.0, v2.2.0, and will be included in v2.3.0.

CVE-2020-10062

Packet length decoding error in MQTT

CVE: An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible remote code execution. NCC-ZEP-031

The MQTT packet header length can be 1 to 4 bytes. An off-by-one error in the code can result in this being interpreted as 5 bytes, which can cause an integer overflow, resulting in memory corruption.

This has been fixed in master for v2.3.

CVE-2020-10063

Remote Denial of Service in CoAP Option Parsing Due To Integer Overflow

A remote adversary with the ability to send arbitrary CoAP packets to be parsed by Zephyr is able to cause a denial of service.

This has been fixed in master for v2.3.

CVE-2020-10067

Integer Overflow In is_in_region Allows User Thread To Access Kernel Memory

A malicious userspace application can cause a integer overflow and bypass security checks performed by system call handlers. The impact would depend on the underlying system call and can range from denial of service to information leak to memory corruption resulting in code execution within the kernel.

See NCC-ZEP-005

This has been fixed in releases v1.14.2, and v2.2.0.

CVE-2020-10068

Zephyr Bluetooth DLE duplicate requests vulnerability

In the Zephyr project Bluetooth subsystem, certain duplicate and back-to-back packets can cause incorrect behavior, resulting in a denial of service.

This has been fixed in branches for v1.14.0, v2.2.0, and will be included in v2.3.0.

CVE-2020-10069

Zephyr Bluetooth unchecked packet data results in denial of service

An unchecked parameter in bluetooth data can result in an assertion failure, or division by zero, resulting in a denial of service attack.

This has been fixed in branches for v1.14.0, v2.2.0, and will be included in v2.3.0.

CVE-2020-10070

MQTT buffer overflow on receive buffer

In the Zephyr Project MQTT code, improper bounds checking can result in memory corruption and possibly remote code execution. NCC-ZEP-031

When calculating the packet length, arithmetic overflow can result in accepting a receive buffer larger than the available buffer space, resulting in user data being written beyond this buffer.

This has been fixed in master for v2.3.

CVE-2020-10071

Insufficient publish message length validation in MQTT

The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031

This has been fixed in master for v2.3.