Detections
Analytics
ABB RTU500 Series Buffer Overflow in embedded OpenSSL (CVE-2021-3711)
critical Tenable OT Security Plugin ID 501742
Synopsis
The remote OT asset is affected by a vulnerability.Description
A vulnerability exists in the OpenSSL Version 1.0.2 that affects the RTU500 Series product versions listed below.RTU500 series CMU Firmware versions 12.0.1 – 12.0.14 12.2.1 – 12.2.11 12.4.1 – 12.4.11 12.6.1 – 12.6.8 12.7.1 – 12.7.5 13.2.1 – 13.2.5 13.3.1 – 13.3.3 13.4.1
In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the out parameter can be NULL and, on exit, the outlen parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non- NULL value for the out parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k).
This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
Refer to the vendor advisory.See Also
https://www.openssl.org/news/secadv/20210824.txt
http://www.nessus.org/u?4e69aead
https://www.cisa.gov/news-events/ics-advisories/icsa-23-143-02
Plugin Details
Severity: Critical
ID: 501742
Version: 1.1
Type: remote
Family: Tenable.ot
Published: 9/29/2023
Updated: 10/2/2023
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.2
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2021-3711
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:hitachienergy:rtu500_firmware:-
Required KB Items: Tenable.ot/ABB
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/24/2021
Vulnerability Publication Date: 8/24/2021
Reference Information
CVE: CVE-2021-3711