# CVE-2009-0846: Use after free in n/a > Remote attackers can crash the Kerberos daemon or execute arbitrary code via invalid DER encoding in the ASN.1 decoder. - **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 9 Apr 2009 - **Updated:** 7 Aug 2024 - **Also known as:** DEBIAN-CVE-2009-0846, GHSA-777p-gw55-q56c, RHSA-2009:0409, RHSA-2009:0410 ## What is CVE-2009-0846? CVE-2009-0846 is a critical use after free vulnerability in Apple Mac Os X, published on 9 Apr 2009. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer. Weakness: CWE-824 (Access of Uninitialized Pointer) ## Which versions are affected by CVE-2009-0846? It affects 9 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `krb5` | Red Hat:enterprise_linux:2.1::as | All versions | 0:1.2.2-49 | | `krb5-devel` | Red Hat:enterprise_linux:2.1::as | All versions | 0:1.2.2-49 | | `krb5-libs` | Red Hat:enterprise_linux:2.1::as | All versions | 0:1.2.2-49 | | `krb5-server` | Red Hat:enterprise_linux:2.1::as | All versions | 0:1.2.2-49 | | `krb5-workstation` | Red Hat:enterprise_linux:2.1::as | All versions | 0:1.2.2-49 | | `krb5` | Red Hat:enterprise_linux:2.1::aw | All versions | 0:1.2.2-49 | | `krb5-devel` | Red Hat:enterprise_linux:2.1::aw | All versions | 0:1.2.2-49 | | `krb5-libs` | Red Hat:enterprise_linux:2.1::aw | All versions | 0:1.2.2-49 | | `krb5-server` | Red Hat:enterprise_linux:2.1::aw | All versions | 0:1.2.2-49 | | `krb5-workstation` | Red Hat:enterprise_linux:2.1::aw | All versions | 0:1.2.2-49 | | `krb5` | Red Hat:enterprise_linux:2.1::es | All versions | 0:1.2.2-49 | | `krb5-devel` | Red Hat:enterprise_linux:2.1::es | All versions | 0:1.2.2-49 | | `krb5-libs` | Red Hat:enterprise_linux:2.1::es | All versions | 0:1.2.2-49 | | `krb5-server` | Red Hat:enterprise_linux:2.1::es | All versions | 0:1.2.2-49 | | `krb5-workstation` | Red Hat:enterprise_linux:2.1::es | All versions | 0:1.2.2-49 | | `krb5` | Red Hat:enterprise_linux:2.1::ws | All versions | 0:1.2.2-49 | | `krb5-devel` | Red Hat:enterprise_linux:2.1::ws | All versions | 0:1.2.2-49 | | `krb5-libs` | Red Hat:enterprise_linux:2.1::ws | All versions | 0:1.2.2-49 | | `krb5-server` | Red Hat:enterprise_linux:2.1::ws | All versions | 0:1.2.2-49 | | `krb5-workstation` | Red Hat:enterprise_linux:2.1::ws | All versions | 0:1.2.2-49 | | `krb5` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5-devel` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5-libs` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5-server` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5-workstation` | Red Hat:enterprise_linux:3::as | All versions | 0:1.2.7-70 | | `krb5` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5-devel` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5-libs` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5-server` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5-workstation` | Red Hat:enterprise_linux:3::desktop | All versions | 0:1.2.7-70 | | `krb5` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5-devel` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5-libs` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5-server` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5-workstation` | Red Hat:enterprise_linux:3::es | All versions | 0:1.2.7-70 | | `krb5` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-70 | | `krb5-debuginfo` | Red Hat:enterprise_linux:3::ws | All versions | 0:1.2.7-70 | Products: Apple Mac Os X, Canonical Ubuntu Linux, Fedoraproject Fedora, Mit Kerberos 5, Redhat Enterprise Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation. ## How do I fix CVE-2009-0846? Upgrade to a fixed version. ## Is CVE-2009-0846 being exploited? There is no known exploitation of CVE-2009-0846 in the wild and no public exploit code. ## Other vulnerabilities in Apple Mac Os X - [CVE-2014-7169](https://insights.sbomify.com/CVE-2014-7169/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild) - [CVE-2014-6271](https://insights.sbomify.com/CVE-2014-6271/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild) - [CVE-2012-1823](https://insights.sbomify.com/CVE-2012-1823/): PHP-CGI Query String Parameter (critical 9.8, exploited in the wild) - [CVE-2021-30713](https://insights.sbomify.com/CVE-2021-30713/): Apple macOS Unspecified (high 7.8, exploited in the wild) - [CVE-2019-8526](https://insights.sbomify.com/CVE-2019-8526/): Apple macOS Use-After-Free (high 7.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2009-0846 and fix it if it is affected. What it is: CVE-2009-0846 is a critical use after free vulnerability in Apple Mac Os X, published on 9 Apr 2009. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2009-0846 in the wild and no public exploit code. Affected product: Apple Mac Os X. 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-2009-0846/ (Markdown: https://insights.sbomify.com/CVE-2009-0846/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2009-0846 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-0846 - OSV: https://osv.dev/vulnerability/CVE-2009-0846 --- From sbomify Insights: https://insights.sbomify.com/CVE-2009-0846/ Summaries are generated and may contain mistakes; the official description above is the record.