# CVE-2017-12849: Silverstripe CMS User Enumeration

> Remote attackers can enumerate valid users in SilverStripe CMS by analyzing timing discrepancies in login and password reset responses.

- **Severity:** Medium 5.3 (`CVSS:3.0/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:** 12 Oct 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fwhr-g5r4-xgxf

## What is CVE-2017-12849?

CVE-2017-12849 is a medium-severity vulnerability in Silverstripe Silverstripe, published on 12 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Response discrepancy in the login and password reset forms in SilverStripe CMS before 3.5.5 and 3.6.x before 3.6.1 allows remote attackers to enumerate users via timing attacks.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2017-12849?

4 open source packages ship an affected version, including silverstripe/cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `silverstripe/cms` | Packagist | All versions | 3.5.5 |
| `silverstripe/cms` | Packagist | All versions | 3.5.5 |
| `silverstripe/cms` | Packagist | From 3.6 | 3.6.1 |
| `silverstripe/cms` | Packagist | From 3.6 | 3.6.1 |

Products: Silverstripe Silverstripe.

## How do I fix CVE-2017-12849?

Upgrade silverstripe/cms to a fixed version for your release line: 3.5.5 or 3.6.1.

## Is CVE-2017-12849 being exploited?

There is no known exploitation of CVE-2017-12849 in the wild and no public exploit code.

## Other vulnerabilities in Silverstripe Silverstripe

- [CVE-2007-2321](https://insights.sbomify.com/CVE-2007-2321/): Other in n/a (critical 10.0)
- [CVE-2019-12204](https://insights.sbomify.com/CVE-2019-12204/): Missing warning can lead to unauthenticated admin access in SilverStripe (critical 9.8)
- [CVE-2019-5715](https://insights.sbomify.com/CVE-2019-5715/): Silverstripe Framework SQLi Vulnerability (critical 9.8)
- [CVE-2019-12437](https://insights.sbomify.com/CVE-2019-12437/): Silverstripe CSRF Protection Bypass via GraphQL (high 8.8)
- [CVE-2020-6164](https://insights.sbomify.com/CVE-2020-6164/): Silverstripe CMS information disclosure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-12849 and fix it if it is affected.

What it is: CVE-2017-12849 is a medium-severity vulnerability in Silverstripe Silverstripe, published on 12 Oct 2017. 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-2017-12849 in the wild and no public exploit code.

Affected packages and fixed versions:
- silverstripe/cms (Packagist): affected all versions; fixed in 3.5.5
- silverstripe/cms (Packagist): affected all versions; fixed in 3.5.5
- silverstripe/cms (Packagist): affected from 3.6; fixed in 3.6.1
- silverstripe/cms (Packagist): affected from 3.6; fixed in 3.6.1

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-2017-12849/ (Markdown: https://insights.sbomify.com/CVE-2017-12849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12849
- OSV: https://osv.dev/vulnerability/CVE-2017-12849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-12849/
Summaries are generated and may contain mistakes; the official description above is the record.