7.5
HIGH
CVE-2020-12887
Arm Mbed OS CoAP Memory Leakage Vulnerability
Description

Memory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed.

INFO

Published Date :

June 18, 2020, 7:15 p.m.

Last Modified :

July 21, 2021, 11:39 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2020-12887 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Arm mbed-coap
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-12887.

URL Resource
https://github.com/ARMmbed/mbed-coap/pull/116 Third Party Advisory
https://github.com/ARMmbed/mbed-os/issues/12930 Third Party Advisory
https://github.com/ARMmbed/mbed-os/issues/12957 Third Party Advisory
https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93 Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-12887 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-12887 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-401 CWE-190 CWE-401
  • Initial Analysis by [email protected]

    Jun. 25, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/ARMmbed/mbed-coap/pull/116 No Types Assigned https://github.com/ARMmbed/mbed-coap/pull/116 Third Party Advisory
    Changed Reference Type https://github.com/ARMmbed/mbed-os/issues/12930 No Types Assigned https://github.com/ARMmbed/mbed-os/issues/12930 Third Party Advisory
    Changed Reference Type https://github.com/ARMmbed/mbed-os/issues/12957 No Types Assigned https://github.com/ARMmbed/mbed-os/issues/12957 Third Party Advisory
    Changed Reference Type https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93 No Types Assigned https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93 Patch, Third Party Advisory
    Added CWE NIST CWE-401
    Added CPE Configuration AND OR *cpe:2.3:a:arm:mbed-coap:5.1.5:*:*:*:*:*:*:* OR cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-12887 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-12887 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.49 }} 0.14%

score

0.75946

percentile

CVSS31 - Vulnerability Scoring System
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