# CVE-2011-1526: Privilege escalation in n/a > Authenticated users can bypass group restrictions to read, write, or delete files due to unchecked return values in the Kerberos FTP daemon. - **Severity:** Medium 6.5 (`AV:N/AC:L/Au:S/C:P/I:P/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:** 11 Jul 2011 - **Updated:** 6 Aug 2024 - **Also known as:** DSA-2283-1, GHSA-qc9v-p4hp-c5fh, RHSA-2011:0920, RHSA-2012:0306 ## What is CVE-2011-1526? CVE-2011-1526 is a medium-severity vulnerability in Debian Debian Linux, published on 11 Jul 2011. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script. Weakness: CWE-269 (Improper Privilege Management) ## Which versions are affected by CVE-2011-1526? It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `krb5` | Red Hat:enterprise_linux:5::client | All versions | 0:1.6.1-70.el5 | | `krb5-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 0:1.6.1-70.el5 | | `krb5-libs` | Red Hat:enterprise_linux:5::client | All versions | 0:1.6.1-70.el5 | | `krb5-workstation` | Red Hat:enterprise_linux:5::client | All versions | 0:1.6.1-70.el5 | | `krb5` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.6.1-70.el5 | | `krb5-debuginfo` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.6.1-70.el5 | | `krb5-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.6.1-70.el5 | | `krb5-server` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.6.1-70.el5 | | `krb5-server-ldap` | Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.6.1-70.el5 | | `krb5` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-devel` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-libs` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-server` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-server-ldap` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-workstation` | Red Hat:enterprise_linux:5::server | All versions | 0:1.6.1-70.el5 | | `krb5-appl` | Red Hat:enterprise_linux:6::server | All versions | 0:1.0.1-2.el6_1.1 | | `krb5-appl-clients` | Red Hat:enterprise_linux:6::server | All versions | 0:1.0.1-2.el6_1.1 | | `krb5-appl-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:1.0.1-2.el6_1.1 | | `krb5-appl-servers` | Red Hat:enterprise_linux:6::server | All versions | 0:1.0.1-2.el6_1.1 | Products: Debian Debian Linux, Fedoraproject Fedora, Mit Krb5-Appl, Opensuse Opensuse, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server, Suse Linux Enterprise Software Development Kit. ## How do I fix CVE-2011-1526? Apply the vendor's patch. ## Is CVE-2011-1526 being exploited? There is no known exploitation of CVE-2011-1526 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2011-1526 and fix it if it is affected. What it is: CVE-2011-1526 is a medium-severity vulnerability in Debian Debian Linux, published on 11 Jul 2011. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2011-1526 in the wild and no public exploit code. Affected product: Debian Debian 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-2011-1526/ (Markdown: https://insights.sbomify.com/CVE-2011-1526/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1526 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1526 - OSV: https://osv.dev/vulnerability/CVE-2011-1526 --- From sbomify Insights: https://insights.sbomify.com/CVE-2011-1526/ Summaries are generated and may contain mistakes; the official description above is the record.