# CVE-2017-11103: Auth bypass in n/a

> Remote attackers can impersonate services by exploiting a Kerberos protocol violation in Heimdal, allowing unauthorized access and potential account takeover.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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:** 13 Jul 2017
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2017-11103, CLEANSTART-2024-WM93067, DEBIAN-CVE-2017-11103, DLA-1027-1, DSA-3909-1, DSA-3912-1, ECHO-5fb5-4f74-b231, GHSA-7cm4-q9wm-9w5g, MGASA-2017-0265, MGASA-2017-0326, SUSE-SU-2017:2237-1, UBUNTU-CVE-2017-11103, USN-3353-1, USN-3353-2

## What is CVE-2017-11103?

CVE-2017-11103 is a high-severity authentication bypass vulnerability in Apple Iphone Os, published on 13 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2017-11103?

It affects 6 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `samba` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 4.6.7+git.38.90b2cdb4f22-3.7.1 |
| `resource-agents` | SUSE:Linux Enterprise High Availability Extension 12 SP3 | All versions | 4.0.1+git.1495055229.643177f1-2.4.2 |
| `samba` | SUSE:Linux Enterprise High Availability Extension 12 SP3 | All versions | 4.6.7+git.38.90b2cdb4f22-3.7.1 |
| `samba` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 4.6.7+git.38.90b2cdb4f22-3.7.1 |
| `samba` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 4.6.7+git.38.90b2cdb4f22-3.7.1 |
| `samba` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 4.6.7+git.38.90b2cdb4f22-3.7.1 |

Products: Apple Iphone Os, Apple Mac Os X, Debian Debian Linux, Freebsd Freebsd, Heimdal Project Heimdal, Samba Samba.

## How do I fix CVE-2017-11103?

Upgrade to a fixed version.

## Is CVE-2017-11103 being exploited?

There is no known exploitation of CVE-2017-11103 in the wild and no public exploit code.

## Other vulnerabilities in Apple Iphone Os

- [CVE-2021-30666](https://insights.sbomify.com/CVE-2021-30666/): Apple iOS WebKit Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2021-30761](https://insights.sbomify.com/CVE-2021-30761/): Apple iOS WebKit Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2021-30762](https://insights.sbomify.com/CVE-2021-30762/): Apple iOS WebKit Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2016-4657](https://insights.sbomify.com/CVE-2016-4657/): Apple iOS Webkit Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2019-7286](https://insights.sbomify.com/CVE-2019-7286/): Apple Multiple Products Memory Corruption (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-11103 and fix it if it is affected.

What it is: CVE-2017-11103 is a high-severity authentication bypass vulnerability in Apple Iphone Os, published on 13 Jul 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-2017-11103 in the wild and no public exploit code.

Affected product: Apple Iphone Os. 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-2017-11103/ (Markdown: https://insights.sbomify.com/CVE-2017-11103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-11103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-11103
- OSV: https://osv.dev/vulnerability/CVE-2017-11103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-11103/
Summaries are generated and may contain mistakes; the official description above is the record.