# CVE-2011-0762: Denial of service in n/a

> Authenticated remote attackers can cause denial of service in vsftpd via crafted glob expressions in STAT commands, leading to CPU exhaustion.

- **Severity:** Medium 4.0 (`AV:N/AC:L/Au:S/C:N/I:N/A:P`)
- **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:** 2 Mar 2011
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2011-0762, DSA-2305-1, GHSA-jh3r-4mfv-pjv8, RHSA-2011:0337

## What is CVE-2011-0762?

CVE-2011-0762 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 2 Mar 2011. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The vsf_filename_passes_filter function in ls.c in vsftpd before 2.3.3 allows remote authenticated users to cause a denial of service (CPU consumption and process slot exhaustion) via crafted glob expressions in STAT commands in multiple FTP sessions, a different vulnerability than CVE-2010-2632.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2011-0762?

It affects 6 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `vsftpd` | Red Hat:enterprise_linux:4::as | All versions | 0:2.0.1-9.el4 |
| `vsftpd-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:2.0.1-9.el4 |
| `vsftpd` | Red Hat:enterprise_linux:4::es | All versions | 0:2.0.1-9.el4 |
| `vsftpd-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:2.0.1-9.el4 |
| `vsftpd` | Red Hat:enterprise_linux:5::server | All versions | 0:2.0.5-16.el5_6.1 |
| `vsftpd-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 0:2.0.5-16.el5_6.1 |
| `vsftpd` | Red Hat:enterprise_linux:6::server | All versions | 0:2.2.2-6.el6_0.1 |
| `vsftpd-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:2.2.2-6.el6_0.1 |
| `vsftpd` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.2.2-6.el6_0.1 |
| `vsftpd-debuginfo` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.2.2-6.el6_0.1 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse Opensuse, Suse Linux Enterprise Server, Vsftpd Project Vsftpd.

## How do I fix CVE-2011-0762?

Upgrade to a fixed version.

## Is CVE-2011-0762 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-0762 exists.

Public exploit code:

- VSFTPD 2.3.2 and Earlier STAT Denial of Service (metasploit)
- vsftpd 2.3.2 - Denial of Service (exploitdb)
- Um script automatizado melhorando o exploit do cve-2011-0762 postado no exploit-db (github_poc): https://github.com/s3mPr1linux/CVE-2011-0762
- vsftpd < 2.3.3 - DoS (nuclei)

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-0762 and fix it if it is affected.

What it is: CVE-2011-0762 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 2 Mar 2011. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-0762 exists.

Affected product: Canonical Ubuntu Linux. 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-2011-0762/ (Markdown: https://insights.sbomify.com/CVE-2011-0762/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-0762
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-0762
- OSV: https://osv.dev/vulnerability/CVE-2011-0762

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-0762/
Summaries are generated and may contain mistakes; the official description above is the record.