CVE-2020-12883
Arm Mbed OS CoAP Buffer Over-read Vulnerability
Description
Buffer over-reads were discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses CoAP input linearly using a while loop. Once an option is parsed in a loop, the current point (*packet_data_pptr) is increased correspondingly. The pointer is restricted by the size of the received buffer, as well as by the option delta and option length bytes. The actual input packet length is not verified against the number of bytes read when processing the option extended delta and the option extended length. Moreover, the calculation of the message_left variable, in the case of non-extended option deltas, is incorrect and indicates more data left for processing than provided in the function input. All of these lead to heap-based or stack-based memory location read access that is outside of the intended boundary of the buffer. Depending on the platform-specific memory management mechanisms, it can lead to processing of unintended inputs or system memory access violation errors.
INFO
Published Date :
June 18, 2020, 7:15 p.m.
Last Modified :
July 21, 2021, 11:39 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
3.9
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-2020-12883.
| URL | Resource |
|---|---|
| https://github.com/ARMmbed/mbed-coap/pull/116 | Third Party Advisory |
| https://github.com/ARMmbed/mbed-os/issues/12925 | Third Party Advisory |
| https://github.com/ARMmbed/mbed-os/issues/12926 | Third Party Advisory |
| https://github.com/ARMmbed/mbed-os/issues/12927 | 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).
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The following list is the news that have been mention
CVE-2020-12883 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-12883 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-119 CWE-125 -
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:P/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/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/12925 No Types Assigned https://github.com/ARMmbed/mbed-os/issues/12925 Third Party Advisory Changed Reference Type https://github.com/ARMmbed/mbed-os/issues/12926 No Types Assigned https://github.com/ARMmbed/mbed-os/issues/12926 Third Party Advisory Changed Reference Type https://github.com/ARMmbed/mbed-os/issues/12927 No Types Assigned https://github.com/ARMmbed/mbed-os/issues/12927 Third Party Advisory Added CWE NIST CWE-119 Added CPE Configuration OR *cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-12883 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-2020-12883
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.49 }} 0.13%
score
0.75754
percentile