CVE Vulnerabilities

CVE-2020-11637

Missing Release of Memory after Effective Lifetime

Published: Oct 15, 2020 | Modified: Sep 14, 2021
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu

A memory leak in the TFTP service in B&R Automation Runtime versions <N4.26, <N4.34, <F4.45, <E4.53, <D4.63, <A4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.

Weakness

The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

Affected Software

Name Vendor Start Version End Version
Automation_runtime Br-automation * 4.10 (including)
Automation_runtime Br-automation 4.20 (including) n4.26 (excluding)
Automation_runtime Br-automation 4.40 (including) f4.45 (excluding)
Automation_runtime Br-automation 4.50 (including) e4.53 (excluding)
Automation_runtime Br-automation 4.60 (including) d4.63 (excluding)
Automation_runtime Br-automation 4.70 (including) a4.73 (excluding)

Potential Mitigations

  • Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
  • For example, glibc in Linux provides protection against free of invalid pointers.
  • When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
  • To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References