8.2
CWE
787
Advisory Published
Updated

CVE-2021-21257: Out-of-bounds write in RPL-Classic and RPL-Lite

First published: Fri Jun 18 2021(Updated: )

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.

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Contiki-ng Contiki-ng<4.6

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Frequently Asked Questions

  • What is CVE-2021-21257?

    CVE-2021-21257 is a vulnerability in the RPL-Classic and RPL-Lite implementations in the Contiki-NG operating system versions prior to 4.6.

  • What is Contiki-NG?

    Contiki-NG is an open-source, cross-platform operating system for internet of things devices.

  • How does CVE-2021-21257 affect Contiki-NG?

    CVE-2021-21257 allows an attacker to exploit a vulnerability in the RPL source routing header, potentially compromising the security of Contiki-NG devices running versions prior to 4.6.

  • What is the severity of CVE-2021-21257?

    The severity of CVE-2021-21257 is high, with a severity value of 7.5.

  • How can I fix CVE-2021-21257?

    To fix CVE-2021-21257, it is recommended to update the Contiki-NG operating system to version 4.6 or later.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203