# CVE-2020-11639: Insufficient access control on Inter process communication,

> Local attackers can inject data into IPC channels to manipulate controller data or crash processes in ABB Advant MOD 300 systems.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jul 2024
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-c2jh-qjfq-m6h4

## What is CVE-2020-11639?

CVE-2020-11639 is a high-severity missing authorization vulnerability in ABB Advant MOD 300 AdvaBuild, published on 23 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An attacker could exploit the vulnerability by
injecting garbage data or specially crafted data. Depending on the data injected each process might be
affected differently. The process could crash or cause communication issues on the affected node, effectively causing a denial-of-service attack. The attacker could tamper with the data transmitted, causing
the product to store wrong information or act on wrong data or display wrong information.

This issue affects Advant MOD 300 AdvaBuild: from 3.0 through 3.7 SP2.

For an attack to be successful, the attacker must have local access to a node in the system and be able to
start a specially crafted application that disrupts the communication.
An attacker who successfully exploited the vulnerability would be able to manipulate the data in such
way as allowing reads and writes to the controllers or cause Windows processes in 800xA for MOD 300
and AdvaBuild to crash.

Weakness: CWE-924 (Improper Enforcement of Message Integrity During Transmission in a Communication Channel)

## Which versions are affected by CVE-2020-11639?

It affects 1 product.


Products: Abb Advabuild.

## How do I fix CVE-2020-11639?

No fix has been published for CVE-2020-11639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-11639 being exploited?

There is no known exploitation of CVE-2020-11639 in the wild and no public exploit code.

## Other vulnerabilities in ABB Advant MOD 300 AdvaBuild

- [CVE-2020-11640](https://insights.sbomify.com/CVE-2020-11640/): Elevation of Privilege (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11639 and fix it if it is affected.

What it is: CVE-2020-11639 is a high-severity missing authorization vulnerability in ABB Advant MOD 300 AdvaBuild, published on 23 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11639 in the wild and no public exploit code.

Affected product: ABB Advant MOD 300 AdvaBuild. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-11639/ (Markdown: https://insights.sbomify.com/CVE-2020-11639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11639
- OSV: https://osv.dev/vulnerability/CVE-2020-11639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11639/
Summaries are generated and may contain mistakes; the official description above is the record.