CVE-2023-34100: Out-of-Bounds Read in contiki-ng

Vulnerability summary

CVE-2023-34100 is a high (CVSS 7.3) Out-of-bounds Read vulnerability in contiki-ng. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.9% of scored vulnerabilities.

Timeline

1. 09-06-2023
   PublishedVulnerability first disclosed.
2. 06-01-2025
   Last modifiedVulnerability information updated.

Description

Contiki-NG is an open-source, cross-platform operating system for IoT devices. When reading the TCP MSS option value from an incoming packet, the Contiki-NG OS does not verify that certain buffer indices to read from are within the bounds of the IPv6 packet buffer, uip_buf. In particular, there is a 2-byte buffer read in the module os/net/ipv6/uip6.c. The buffer is indexed using 'UIP_IPTCPH_LEN + 2 + c' and 'UIP_IPTCPH_LEN + 3 + c', but the uip_buf buffer may not have enough data, resulting in a 2-byte read out of bounds. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in release 4.9. Users are advised to watch for the 4.9 release and to upgrade when it becomes available. There are no workarounds for this vulnerability aside from manually patching with the diff in commit `cde4e9839`.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.