Vulnerability Details CVE-2021-21257
Contiki-NG is an open-source, cross-platform operating system for internet of things devices. The RPL-Classic and RPL-Lite implementations in the Contiki-NG operating system versions prior to 4.6 do not validate the address pointer in the RPL source routing header This makes it possible for an attacker to cause out-of-bounds writes with packets injected into the network stack. Specifically, the problem lies in the rpl_ext_header_srh_update function in the two rpl-ext-header.c modules for RPL-Classic and RPL-Lite respectively. The addr_ptr variable is calculated using an unvalidated CMPR field value from the source routing header. An out-of-bounds write can be triggered on line 151 in os/net/routing/rpl-lite/rpl-ext-header.c and line 261 in os/net/routing/rpl-classic/rpl-ext-header.c, which contain the following memcpy call with addr_ptr as destination. The problem has been patched in Contiki-NG 4.6. Users can apply a patch out-of-band as a workaround.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 55.7%
CVSS Severity
CVSS v3 Score 8.2
CVSS v2 Score 5.0
References
Products affected by CVE-2021-21257
-
cpe:2.3:o:contiki-ng:contiki-ng:-
-
cpe:2.3:o:contiki-ng:contiki-ng:2.0
-
cpe:2.3:o:contiki-ng:contiki-ng:2.1
-
cpe:2.3:o:contiki-ng:contiki-ng:2.2
-
cpe:2.3:o:contiki-ng:contiki-ng:2.2.1
-
cpe:2.3:o:contiki-ng:contiki-ng:2.2.2
-
cpe:2.3:o:contiki-ng:contiki-ng:2.2.3
-
cpe:2.3:o:contiki-ng:contiki-ng:2.3
-
cpe:2.3:o:contiki-ng:contiki-ng:2.4
-
cpe:2.3:o:contiki-ng:contiki-ng:2.5
-
cpe:2.3:o:contiki-ng:contiki-ng:2.6
-
cpe:2.3:o:contiki-ng:contiki-ng:2.7
-
cpe:2.3:o:contiki-ng:contiki-ng:3.0
-
cpe:2.3:o:contiki-ng:contiki-ng:4.0
-
cpe:2.3:o:contiki-ng:contiki-ng:4.1
-
cpe:2.3:o:contiki-ng:contiki-ng:4.2
-
cpe:2.3:o:contiki-ng:contiki-ng:4.3
-
cpe:2.3:o:contiki-ng:contiki-ng:4.4
-
cpe:2.3:o:contiki-ng:contiki-ng:4.5