Out-of-bounds Write Affecting contiki-ng/contiki-ng package, versions [,4.6)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.11% (45th percentile)

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  • Snyk IDSNYK-UNMANAGED-CONTIKINGCONTIKING-6137933
  • published22 Dec 2023
  • disclosed18 Jun 2021
  • creditUnknown

Introduced: 18 Jun 2021

CVE-2021-21257  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade contiki-ng/contiki-ng to version 4.6 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Write. 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.

CVSS Scores

version 3.1