# CVE-2018-1000005: Information disclosure in n/a

> Out-of-bounds read in libcurl HTTP/2 trailer handling allows attackers to cause crashes or disclose sensitive memory contents.

- **Severity:** Critical 9.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Jan 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-1000005, CURL-CVE-2018-1000005, DEBIAN-CVE-2018-1000005, GHSA-cj8j-r7q8-xg4f, UBUNTU-CVE-2018-1000005

## What is CVE-2018-1000005?

CVE-2018-1000005 is a critical vulnerability in Canonical Ubuntu Linux, published on 24 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.

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

## Which versions are affected by CVE-2018-1000005?

It affects 3 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Haxx Libcurl.

## How do I fix CVE-2018-1000005?

Upgrade to a fixed version.

## Is CVE-2018-1000005 being exploited?

There is no known exploitation of CVE-2018-1000005 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1000005 and fix it if it is affected.

What it is: CVE-2018-1000005 is a critical vulnerability in Canonical Ubuntu Linux, published on 24 Jan 2018. 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-2018-1000005 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2018-1000005/ (Markdown: https://insights.sbomify.com/CVE-2018-1000005/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000005
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000005
- OSV: https://osv.dev/vulnerability/CVE-2018-1000005

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000005/
Summaries are generated and may contain mistakes; the official description above is the record.