# CVE-2020-29582: Incorrect Default Permissions in JetBrains Kotlin

> An attacker can read data from temporary files and list directories due to insecure permissions in the Kotlin standard library.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-29582, GHSA-cqj8-47ch-rvvq, UBUNTU-CVE-2020-29582

## What is CVE-2020-29582?

CVE-2020-29582 is a medium-severity vulnerability in Oracle Communications Cloud Native Core Policy, published on 3 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In JetBrains Kotlin before 1.4.21, a vulnerable Java API was used for temporary file and folder creation. An attacker was able to read data from such files and list directories due to insecure permissions.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2020-29582?

2 open source packages ship an affected version, including org.jetbrains.kotlin:kotlin-stdlib. It affects 4 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.jetbrains.kotlin:kotlin-stdlib` | Maven | All versions | 1.4.21 |
| `org.jetbrains.kotlin:kotlin-stdlib` | Maven | All versions | 1.4.21 |

Products: Jetbrains Kotlin, Oracle Communications Cloud Native Core Network Slice Selection Function, Oracle Communications Cloud Native Core Policy, Oracle Communications Cloud Native Core Service Communication Proxy.

## How do I fix CVE-2020-29582?

Upgrade org.jetbrains.kotlin:kotlin-stdlib to 1.4.21 or later.

## Is CVE-2020-29582 being exploited?

There is no known exploitation of CVE-2020-29582 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Communications Cloud Native Core Policy

- [CVE-2020-15824](https://insights.sbomify.com/CVE-2020-15824/): Privilege escalation in n/a (high 8.8)
- [CVE-2019-10101](https://insights.sbomify.com/CVE-2019-10101/): Other in n/a (high 8.1)
- [CVE-2019-10102](https://insights.sbomify.com/CVE-2019-10102/): Supply chain in n/a (high 8.1)
- [CVE-2019-10103](https://insights.sbomify.com/CVE-2019-10103/): Other in n/a (high 8.1)
- [CVE-2026-53914](https://insights.sbomify.com/CVE-2026-53914/): JetBrains Kotlin: Unsafe Deserialization in Kotlin Build Cache Enables Code Execution (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-29582 and fix it if it is affected.

What it is: CVE-2020-29582 is a medium-severity vulnerability in Oracle Communications Cloud Native Core Policy, published on 3 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-29582 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.jetbrains.kotlin:kotlin-stdlib (Maven): affected all versions; fixed in 1.4.21
- org.jetbrains.kotlin:kotlin-stdlib (Maven): affected all versions; fixed in 1.4.21

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-2020-29582/ (Markdown: https://insights.sbomify.com/CVE-2020-29582/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-29582
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-29582
- OSV: https://osv.dev/vulnerability/CVE-2020-29582

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-29582/
Summaries are generated and may contain mistakes; the official description above is the record.