Out-of-bounds read in SNMP when decoding a string in Contiki-NG

Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-ber.c module, where the function snmp_ber_decode_string_len_buffer decodes the string length from a received SNMP packet. In one place, one byte is read from the buffer, without checking that the buffer has another byte available, leading to a possible out-of-bounds read. The problem has been patched in Contiki-NG pull request #2936. It will be included in the next release of Contiki-NG. Users are advised to apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

跨界内存读

Contiki-NG 缓冲区错误漏洞

Contiki-NG是Contiki-NG开源的一个适用于物联网中资源受限设备的操作系统。 Contiki-NG存在缓冲区错误漏洞，该漏洞源于向运行启用了 SNMP 的 Contiki-NG 操作系统的设备发送数据包时，可能会触发 1 字节的越界读取。

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