# CVE-2019-1258: Azure Active Directory Authentication Library Elevation of Privilege Vulnerability

> An authenticated attacker can exploit token caching flaws in Azure AD Authentication Library to perform actions as another user.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Aug 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xc6x-cq47-9chw

## What is CVE-2019-1258?

CVE-2019-1258 is a high-severity vulnerability in Microsoft ADAL.NET, published on 14 Aug 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An elevation of privilege vulnerability exists in Azure Active Directory Authentication Library On-Behalf-Of flow, in the way the library caches tokens. This vulnerability allows an authenticated attacker to perform actions in context of another user.
The authenticated attacker can exploit this vulneraiblity by accessing a service configured for On-Behalf-Of flow that assigns incorrect tokens.
This security update addresses the vulnerability by removing fallback cache look-up for On-Behalf-Of scenarios.

## Which versions are affected by CVE-2019-1258?

2 open source packages ship an affected version, including microsoft.identitymodel.clients.activedirectory. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `microsoft.identitymodel.clients.activedirectory` | NuGet | From 5.0.0 | 5.2.0 |
| `microsoft.identitymodel.clients.activedirectory` | NuGet | From 5.0.0 | 5.2.0 |

Products: Microsoft Active Directory Authentication Library, Microsoft Nuget.

## How do I fix CVE-2019-1258?

Upgrade microsoft.identitymodel.clients.activedirectory to 5.2.0 or later.

## Is CVE-2019-1258 being exploited?

There is no known exploitation of CVE-2019-1258 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1258 and fix it if it is affected.

What it is: CVE-2019-1258 is a high-severity vulnerability in Microsoft ADAL.NET, published on 14 Aug 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-1258 in the wild and no public exploit code.

Affected packages and fixed versions:
- microsoft.identitymodel.clients.activedirectory (NuGet): affected from 5.0.0; fixed in 5.2.0
- microsoft.identitymodel.clients.activedirectory (NuGet): affected from 5.0.0; fixed in 5.2.0

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-2019-1258/ (Markdown: https://insights.sbomify.com/CVE-2019-1258/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1258
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1258
- OSV: https://osv.dev/vulnerability/CVE-2019-1258

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1258/
Summaries are generated and may contain mistakes; the official description above is the record.