CVE-2020-12884 Memory corruption in n/a
A buffer over-read in the CoAP parser allows attackers to read out-of-bounds memory or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-12884?
CVE-2020-12884 is a critical memory corruption vulnerability in n/a, published on 18 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A buffer over-read was 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_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made.
Weakness: CWE-125
Which versions are affected by CVE-2020-12884?
It affects 1 product.
Products include Arm Mbed Os.
How do I fix CVE-2020-12884?
No fix has been published for CVE-2020-12884 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-12884 being exploited?
There is no known exploitation of CVE-2020-12884 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-ghhj-m687-4jqx.