SB2021031005 - Out-of-bounds Read in Siemens SCALANCE and SIMATIC NET CM 1542-1

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Main Vulnerability Database SB2021031005

SB2021031005 - Out-of-bounds Read in Siemens SCALANCE and SIMATIC NET CM 1542-1

Published: March 10, 2021

Security Bulletin ID SB2021031005
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap out-of-bounds read (CVE-ID: CVE-2019-3823)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear


The vulnerability allows a remote attacker to gain access to potentially sensitive information or cause the service to crash.

The vulnerability exists due to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. A remote attacker can trigger heap out-of-bounds read error and read contents of memory on the system or cause the service to crash..


Remediation

Install update from vendor's website.

References