CVE-2020-12887
CVSS V2 Medium 5
CVSS V3 High 7.5
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.
Overview
- CVE ID
- CVE-2020-12887
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2020-06-18T19:15:11
- Last Modified Date
- 2021-07-21T11:39:23
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:a:arm:mbed-coap:5.1.5:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:* | 0 | OR |
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/ARMmbed/mbed-os/issues/12957 | Third Party Advisory |
| https://github.com/mjurczak/mbed-coap/commit/4647a68e364401e81dbd370728127d844f221d93 | Patch Third Party Advisory |
| https://github.com/ARMmbed/mbed-os/issues/12930 | Third Party Advisory |
| https://github.com/ARMmbed/mbed-coap/pull/116 | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-12887 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12887 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:01:57 | Added to TrackCVE | |||
| 2022-12-04 18:18:46 | 2020-06-18T19:15Z | 2020-06-18T19:15:11 | CVE Published Date | updated |
| 2022-12-04 18:18:46 | 2021-07-21T11:39:23 | CVE Modified Date | updated | |
| 2022-12-04 18:18:46 | Analyzed | Vulnerability Status | updated |