# CVE-2011-1678: Denial of service in n/a

> Local attackers can corrupt the /etc/mtab file by exploiting missing resource limit checks in Samba's mount and umount utilities.

- **Severity:** Low 3.3 (`AV:L/AC:M/Au:N/C:P/I:P/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:** Yes
- **Published:** 10 Apr 2011
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2011-1678, ECHO-df75-4cfc-459b, GHSA-v7g7-rpcw-4f58

## What is CVE-2011-1678?

CVE-2011-1678 is a low-severity denial of service vulnerability in Samba Samba, published on 10 Apr 2011. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

smbfs in Samba 3.5.8 and earlier attempts to use (1) mount.cifs to append to the /etc/mtab file and (2) umount.cifs to append to the /etc/mtab.tmp file without first checking whether resource limits would interfere, which allows local users to trigger corruption of the /etc/mtab file via a process with a small RLIMIT_FSIZE value, a related issue to CVE-2011-1089.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2011-1678?

It affects 1 product.


Products: Samba Samba.

## How do I fix CVE-2011-1678?

Apply the vendor's patch.

## Is CVE-2011-1678 being exploited?

There is no known exploitation of CVE-2011-1678 in the wild and no public exploit code.

## Other vulnerabilities in Samba Samba

- [CVE-2012-1182](https://insights.sbomify.com/CVE-2012-1182/): Integer overflow in n/a (critical 10.0)
- [CVE-2007-2446](https://insights.sbomify.com/CVE-2007-2446/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0600](https://insights.sbomify.com/CVE-2004-0600/): Memory corruption in n/a (critical 10.0)
- [CVE-1999-0810](https://insights.sbomify.com/CVE-1999-0810/): Denial of service in n/a (critical 10.0)
- [CVE-1999-0182](https://insights.sbomify.com/CVE-1999-0182/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-1678 and fix it if it is affected.

What it is: CVE-2011-1678 is a low-severity denial of service vulnerability in Samba Samba, published on 10 Apr 2011. 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-2011-1678 in the wild and no public exploit code.

Affected product: Samba Samba. 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-2011-1678/ (Markdown: https://insights.sbomify.com/CVE-2011-1678/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1678
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1678
- OSV: https://osv.dev/vulnerability/CVE-2011-1678

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-1678/
Summaries are generated and may contain mistakes; the official description above is the record.