# CVE-2018-0100: XML external entity in Cisco AnyConnect

> An unauthenticated local attacker can read and write files via XML External Entity injection in the Profile Editor.

- **Severity:** Medium 4.4 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **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:** 18 Jan 2018
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-8f5h-g89q-h3fx

## What is CVE-2018-0100?

CVE-2018-0100 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 18 Jan 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Profile Editor of the Cisco AnyConnect Secure Mobility Client could allow an unauthenticated, local attacker to have read and write access to information stored in the affected system. The vulnerability is due to improper handling of the XML External Entity (XXE) entries when parsing an XML file. An attacker could exploit this vulnerability by injecting a crafted XML file with malicious entries, which could allow the attacker to read and write files. Cisco Bug IDs: CSCvg19341.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2018-0100?

It affects 1 product.


Products: Cisco Anyconnect Secure Mobility Client.

## How do I fix CVE-2018-0100?

No fix has been published for CVE-2018-0100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0100 being exploited?

There is no known exploitation of CVE-2018-0100 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Anyconnect Secure Mobility Client

- [CVE-2020-3433](https://insights.sbomify.com/CVE-2020-3433/): Cisco AnyConnect Secure Mobility Client for Windows DLL Hijacking (high 7.8, exploited in the wild)
- [CVE-2020-3153](https://insights.sbomify.com/CVE-2020-3153/): Cisco AnyConnect Secure Mobility Client for Windows Uncontrolled Search Path (medium 6.5, exploited in the wild)
- [CVE-2012-3088](https://insights.sbomify.com/CVE-2012-3088/): Security feature bypass in n/a (critical 9.3)
- [CVE-2012-2493](https://insights.sbomify.com/CVE-2012-2493/): Code injection in n/a (critical 9.3)
- [CVE-2011-2040](https://insights.sbomify.com/CVE-2011-2040/): Code injection in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0100 and fix it if it is affected.

What it is: CVE-2018-0100 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 18 Jan 2018. 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-2018-0100 in the wild and no public exploit code.

Affected product: Cisco Anyconnect Secure Mobility Client. 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-2018-0100/ (Markdown: https://insights.sbomify.com/CVE-2018-0100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0100
- OSV: https://osv.dev/vulnerability/CVE-2018-0100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0100/
Summaries are generated and may contain mistakes; the official description above is the record.