# CVE-2018-20783: Information disclosure in n/a

> An attacker can read sensitive memory contents by crafting a malicious PHAR file, potentially exposing private data in applications using PHP.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** 21 Feb 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-gx4f-r59p-mgpx, UBUNTU-CVE-2018-20783

## What is CVE-2018-20783?

CVE-2018-20783 is a high-severity vulnerability in Opensuse Leap, published on 21 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In PHP before 5.6.39, 7.x before 7.0.33, 7.1.x before 7.1.25, and 7.2.x before 7.2.13, a buffer over-read in PHAR reading functions may allow an attacker to read allocated or unallocated memory past the actual data when trying to parse a .phar file. This is related to phar_parse_pharfile in ext/phar/phar.c.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2018-20783?

It affects 2 products.


Products: Opensuse Leap, Php Php.

## How do I fix CVE-2018-20783?

Upgrade to a fixed version.

## Is CVE-2018-20783 being exploited?

There is no known exploitation of CVE-2018-20783 in the wild and no public exploit code.

## Other vulnerabilities in Opensuse Leap

- [CVE-2015-4902](https://insights.sbomify.com/CVE-2015-4902/): Oracle Java SE Integrity Check (medium 5.3, exploited in the wild)
- [CVE-2017-14804](https://insights.sbomify.com/CVE-2017-14804/): package builds could use directory traversal to write outside of target area (critical 9.9)
- [CVE-2019-20787](https://insights.sbomify.com/CVE-2019-20787/): Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. (critical 9.8)
- [CVE-2019-8341](https://insights.sbomify.com/CVE-2019-8341/): Code injection in n/a (critical 9.8)
- [CVE-2019-6438](https://insights.sbomify.com/CVE-2019-6438/): Other in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-20783 and fix it if it is affected.

What it is: CVE-2018-20783 is a high-severity vulnerability in Opensuse Leap, published on 21 Feb 2019. 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-2018-20783 in the wild and no public exploit code.

Affected product: Opensuse Leap. 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-2018-20783/ (Markdown: https://insights.sbomify.com/CVE-2018-20783/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-20783
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-20783
- OSV: https://osv.dev/vulnerability/CVE-2018-20783

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-20783/
Summaries are generated and may contain mistakes; the official description above is the record.