PT-2020-13318 · Arm · Arm Mbed Os
Mjurczak
·
Published
2020-06-18
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Updated
2020-06-25
·
CVE-2020-12886
CVSS v3.1
9.1
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Arm Mbed OS version 5.15.3
Description
A buffer over-read was discovered in the CoAP library. The CoAP parser is responsible for parsing received CoAP packets. The function
sn coap parser options parse() parses the CoAP packet header starting from the message token. The length of the token in the received message is provided in the first byte parsed by the sn coap parser options parse() function. The length encoded in the message is not validated against the actual input buffer length before accessing the token. As a result, memory access outside of the intended boundary of the buffer may occur.Recommendations
For Arm Mbed OS version 5.15.3, as a temporary workaround, consider disabling the
sn coap parser options parse() function until a patch is available. Restrict access to the CoAP library to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Out of bounds Read
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Weakness Enumeration
Related Identifiers
Affected Products
Arm Mbed Os