CVE-2021-21257

CVSS V2 Medium 5 CVSS V3 High 7.5
Description
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.
Overview
  • CVE ID
  • CVE-2021-21257
  • Assigner
  • security-advisories@github.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-06-18T21:15:07
  • Last Modified Date
  • 2021-06-24T19:35:00
Weakness Enumerations
CWE URL
CWE-787 http://cwe.mitre.org/data/definitions/787.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:* 1 OR 4.6
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://github.com/contiki-ng/contiki-ng/pull/1431 Patch Third Party Advisory
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mvc7-9p4q-c5cm Patch Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-21257
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21257
History
Created Old Value New Value Data Type Notes
2022-05-10 07:09:55 Added to TrackCVE
2022-12-05 04:38:46 2021-06-18T21:15Z 2021-06-18T21:15:07 CVE Published Date updated
2022-12-05 04:38:46 2021-06-24T19:35:00 CVE Modified Date updated
2022-12-05 04:38:46 Analyzed Vulnerability Status updated