Vulnerability CVE-2024-32017
Published: 2024-05-01

Description:
RIOT is a real-time multi-threading operating system that supports a range of devices that are typically 8-bit, 16-bit and 32-bit microcontrollers. The size check in the `gcoap_dns_server_proxy_get()` function contains a small typo that may lead to a buffer overflow in the subsequent `strcpy()`. In detail, the length of the `_uri` string is checked instead of the length of the `_proxy` string. The `_gcoap_forward_proxy_copy_options()` function does not implement an explicit size check before copying data to the `cep->req_etag` buffer that is `COAP_ETAG_LENGTH_MAX` bytes long. If an attacker can craft input so that `optlen` becomes larger than `COAP_ETAG_LENGTH_MAX`, they can cause a buffer overflow. If the input above is attacker-controlled and crosses a security boundary, the impact of the buffer overflow vulnerabilities could range from denial of service to arbitrary code execution. This issue has yet to be patched. Users are advised to add manual bounds checking.

See advisories in our WLB2 database:
Topic
Author
Date
High
RIOT 2024.01 Buffer Overflows / Lack Of Size Checks / Out-Of-Bound Access
Marco Ivaldi
09.05.2024

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

 References:
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-v97j-w9m6-c4h3
https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/dns.c#L319-L325
https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/forward_proxy.c#L352
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