# CVE-2011-0020: Memory corruption in n/a > A heap-based buffer overflow in Pango allows remote attackers to execute arbitrary code or cause a crash via a crafted font file when the FreeType2 backend is enabled. - **Severity:** High 7.6 (`AV:N/AC:H/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:** A user has to click or open something - **Fix available:** Yes - **Published:** 24 Jan 2011 - **Updated:** 6 Aug 2024 - **Also known as:** DEBIAN-CVE-2011-0020, GHSA-5c8w-jg4w-gcj2, RHSA-2011:0180 ## What is CVE-2011-0020? CVE-2011-0020 is a high-severity memory corruption vulnerability in n/a, published on 24 Jan 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description Heap-based buffer overflow in the pango_ft2_font_render_box_glyph function in pango/pangoft2-render.c in libpango in Pango 1.28.3 and earlier, when the FreeType2 backend is enabled, allows user-assisted remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted font file, related to the glyph box for an FT_Bitmap object. Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) ## Which versions are affected by CVE-2011-0020? It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `evolution28-pango` | Red Hat:enterprise_linux:4::as | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-debuginfo` | Red Hat:enterprise_linux:4::as | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-devel` | Red Hat:enterprise_linux:4::as | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-debuginfo` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-devel` | Red Hat:enterprise_linux:4::desktop | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango` | Red Hat:enterprise_linux:4::es | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-debuginfo` | Red Hat:enterprise_linux:4::es | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-devel` | Red Hat:enterprise_linux:4::es | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango` | Red Hat:enterprise_linux:4::ws | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-debuginfo` | Red Hat:enterprise_linux:4::ws | All versions | 0:1.14.9-13.el4_10 | | `evolution28-pango-devel` | Red Hat:enterprise_linux:4::ws | All versions | 0:1.14.9-13.el4_10 | | `pango` | Red Hat:enterprise_linux:5::server | All versions | 0:1.14.9-8.el5_6.2 | | `pango-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 0:1.14.9-8.el5_6.2 | | `pango-devel` | Red Hat:enterprise_linux:5::server | All versions | 0:1.14.9-8.el5_6.2 | | `pango` | Red Hat:enterprise_linux:6::client | All versions | 0:1.28.1-3.el6_0.3 | | `pango-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:1.28.1-3.el6_0.3 | | `pango-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:1.28.1-3.el6_0.3 | | `pango` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.28.1-3.el6_0.3 | | `pango-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.28.1-3.el6_0.3 | | `pango-devel` | Red Hat:enterprise_linux:6::computenode | All versions | 0:1.28.1-3.el6_0.3 | | `pango` | Red Hat:enterprise_linux:6::server | All versions | 0:1.28.1-3.el6_0.3 | | `pango-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:1.28.1-3.el6_0.3 | | `pango-devel` | Red Hat:enterprise_linux:6::server | All versions | 0:1.28.1-3.el6_0.3 | | `pango` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.28.1-3.el6_0.3 | | `pango-debuginfo` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.28.1-3.el6_0.3 | | `pango-devel` | Red Hat:enterprise_linux:6::workstation | All versions | 0:1.28.1-3.el6_0.3 | Products: Gnome Pango, Pango Pango. ## How do I fix CVE-2011-0020? Upgrade to a fixed version. ## Is CVE-2011-0020 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-0020 exists. Public exploit code: - Pango Font Parsing - 'pangoft2-render.c' Heap Corruption (exploitdb) ## Other vulnerabilities in n/a - [CVE-2011-0064](https://insights.sbomify.com/CVE-2011-0064/): Null dereference in n/a (medium 6.8) - [CVE-2010-0421](https://insights.sbomify.com/CVE-2010-0421/): Denial of service in n/a (medium 4.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2011-0020 and fix it if it is affected. What it is: CVE-2011-0020 is a high-severity memory corruption vulnerability in n/a, published on 24 Jan 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-0020 exists. Affected product: n/a. 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-2011-0020/ (Markdown: https://insights.sbomify.com/CVE-2011-0020/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2011-0020 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-0020 - OSV: https://osv.dev/vulnerability/CVE-2011-0020 --- From sbomify Insights: https://insights.sbomify.com/CVE-2011-0020/ Summaries are generated and may contain mistakes; the official description above is the record.