CVE-2024-32017
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()`.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.54%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.0 CRITICALCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 1.54% probability · 73th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-120
- Affected
- riot-os/riot
- Source
- security-advisories@github.com
References
- http://seclists.org/fulldisclosure/2024/May/7Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/05/07/3Mailing List, Third Party Advisory
- https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/dns.c#L319-L325Product
- https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/forward_proxy.c#L352Product
- https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-v97j-w9m6-c4h3Exploit, Vendor Advisory
- http://seclists.org/fulldisclosure/2024/May/7Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/05/07/3Mailing List, Third Party Advisory
- https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/dns.c#L319-L325Product
- https://github.com/RIOT-OS/RIOT/blob/master/sys/net/application_layer/gcoap/forward_proxy.c#L352Product
- https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-v97j-w9m6-c4h3Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.