# CVE-2011-5000: Denial of service in n/a > Remote authenticated users can cause a denial of service via memory consumption in OpenSSH when GSSAPI authentication is enabled. - **Severity:** Low 3.5 (`AV:N/AC:M/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:** 4 Apr 2012 - **Updated:** 7 Aug 2024 - **Also known as:** DEBIAN-CVE-2011-5000, GHSA-wq52-9gh8-cwrp, RHSA-2012:0884 ## What is CVE-2011-5000? CVE-2011-5000 is a low-severity denial of service vulnerability in OpenSSH, published on 4 Apr 2012. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote authenticated users to cause a denial of service (memory consumption) via a large value in a certain length field. NOTE: there may be limited scenarios in which this issue is relevant. Weakness: CWE-189 ## Which versions are affected by CVE-2011-5000? It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `openssh` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `openssh-askpass` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `openssh-clients` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `openssh-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `openssh-ldap` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `openssh-server` | Red Hat:enterprise_linux:6::client | All versions | 0:5.3p1-81.el6 | | `pam_ssh_agent_auth` | Red Hat:enterprise_linux:6::client | All versions | 0:0.9-81.el6 | | `openssh` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `openssh-askpass` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `openssh-clients` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `openssh-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `openssh-ldap` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `openssh-server` | Red Hat:enterprise_linux:6::computenode | All versions | 0:5.3p1-81.el6 | | `pam_ssh_agent_auth` | Red Hat:enterprise_linux:6::computenode | All versions | 0:0.9-81.el6 | | `openssh` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `openssh-askpass` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `openssh-clients` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `openssh-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `openssh-ldap` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `openssh-server` | Red Hat:enterprise_linux:6::server | All versions | 0:5.3p1-81.el6 | | `pam_ssh_agent_auth` | Red Hat:enterprise_linux:6::server | All versions | 0:0.9-81.el6 | | `openssh` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `openssh-askpass` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `openssh-clients` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `openssh-debuginfo` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `openssh-ldap` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `openssh-server` | Red Hat:enterprise_linux:6::workstation | All versions | 0:5.3p1-81.el6 | | `pam_ssh_agent_auth` | Red Hat:enterprise_linux:6::workstation | All versions | 0:0.9-81.el6 | Products: OpenSSH. ## How do I fix CVE-2011-5000? Apply the vendor's patch. ## Is CVE-2011-5000 being exploited? There is no known exploitation of CVE-2011-5000 in the wild and no public exploit code. ## Other vulnerabilities in OpenSSH - [CVE-2003-0786](https://insights.sbomify.com/CVE-2003-0786/): Auth bypass in n/a (critical 10.0) - [CVE-2003-0693](https://insights.sbomify.com/CVE-2003-0693/): Memory corruption in n/a (critical 10.0) - [CVE-2002-0640](https://insights.sbomify.com/CVE-2002-0640/): Memory corruption in n/a (critical 10.0) - [CVE-2001-0144](https://insights.sbomify.com/CVE-2001-0144/): Integer overflow in n/a (critical 10.0) - [CVE-2000-0999](https://insights.sbomify.com/CVE-2000-0999/): Memory corruption in n/a (critical 10.0) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2011-5000 and fix it if it is affected. What it is: CVE-2011-5000 is a low-severity denial of service vulnerability in OpenSSH, published on 4 Apr 2012. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2011-5000 in the wild and no public exploit code. Affected product: OpenSSH. 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-2011-5000/ (Markdown: https://insights.sbomify.com/CVE-2011-5000/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2011-5000 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-5000 - OSV: https://osv.dev/vulnerability/CVE-2011-5000 --- From sbomify Insights: https://insights.sbomify.com/CVE-2011-5000/ Summaries are generated and may contain mistakes; the official description above is the record.