# CVE-2010-1321: Null dereference in n/a > Remote authenticated users can crash the Kerberos daemon via a malformed AP-REQ message due to a NULL pointer dereference in the GSS-API library. - **Severity:** Medium 6.8 (`AV:N/AC:L/Au:S/C:N/I:N/A:C`) - **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:** 19 May 2010 - **Updated:** 7 Aug 2024 - **Also known as:** DEBIAN-CVE-2010-1321, DSA-2052-1, GHSA-pcm6-6x97-2mrc, RHSA-2010:0423 ## What is CVE-2010-1321? CVE-2010-1321 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 19 May 2010. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description The kg_accept_krb5 function in krb5/accept_sec_context.c in the GSS-API library in MIT Kerberos 5 (aka krb5) through 1.7.1 and 1.8 before 1.8.2, as used in kadmind and other applications, does not properly check for invalid GSS-API tokens, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an AP-REQ message in which the authenticator's checksum field is missing. Weakness: CWE-476 (NULL Pointer Dereference) ## Which versions are affected by CVE-2010-1321? It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `krb5` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5-devel` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5-libs` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5-server` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5-workstation` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-72 | | `krb5` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5-devel` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5-libs` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5-server` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5-workstation` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-72 | | `krb5` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5-devel` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5-libs` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5-server` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5-workstation` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-72 | | `krb5` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5-devel` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5-libs` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5-server` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5-workstation` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-72 | | `krb5` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-devel` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-libs` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-server` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-workstation` | Red Hat:enterprise_linux:4::as | All versions | 0:1.3.4-62.el4_8.2 | | `krb5` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-debuginfo` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-devel` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-libs` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-server` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-workstation` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.3.4-62.el4_8.2 | | `krb5` | Red Hat:enterprise_linux:4::es | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-devel` | Red Hat:enterprise_linux:4::es | All versions | 0:1.3.4-62.el4_8.2 | | `krb5-libs` | Red Hat:enterprise_linux:4::es | All versions | 0:1.3.4-62.el4_8.2 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Mit Kerberos 5, Opensuse Opensuse, Oracle Database Server, Suse Linux Enterprise Server. ## How do I fix CVE-2010-1321? Upgrade to a fixed version. ## Is CVE-2010-1321 being exploited? There is no known exploitation of CVE-2010-1321 in the wild and no public exploit code. ## 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-2010-1321 and fix it if it is affected. What it is: CVE-2010-1321 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 19 May 2010. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2010-1321 in the wild and no public exploit code. 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-2010-1321/ (Markdown: https://insights.sbomify.com/CVE-2010-1321/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2010-1321 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-1321 - OSV: https://osv.dev/vulnerability/CVE-2010-1321 --- From sbomify Insights: https://insights.sbomify.com/CVE-2010-1321/ Summaries are generated and may contain mistakes; the official description above is the record.