# CVE-2015-7547: Memory corruption in n/a > Remote attackers can execute arbitrary code or cause denial of service via crafted DNS responses exploiting stack buffer overflows in glibc. - **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 18 Feb 2016 - **Updated:** 6 Aug 2024 - **Also known as:** DEBIAN-CVE-2015-7547, DLA-416-1, GHSA-5xr7-h7cp-w9pc, RHSA-2016:0175, RHSA-2016:0225, RHSA-2016:0277, SUSE-RU-2016:0496-1, UBUNTU-CVE-2015-7547, USN-2900-1 ## What is CVE-2015-7547? CVE-2015-7547 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 18 Feb 2016. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc or libc6) before 2.23 allow remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted DNS response that triggers a call to the getaddrinfo function with the AF_UNSPEC or AF_INET6 address family, related to performing "dual A/AAAA DNS queries" and the libnss_dns.so.2 NSS module. Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) ## Which versions are affected by CVE-2015-7547? It affects 30 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `glibc` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-common` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo-common` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-headers` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-static` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-utils` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `nscd` | Red Hat:enterprise_linux:6::client | All versions | 0:2.12-1.166.el6_7.7 | | `glibc` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-common` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo-common` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-devel` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-headers` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-static` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-utils` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `nscd` | Red Hat:enterprise_linux:6::computenode | All versions | 0:2.12-1.166.el6_7.7 | | `rhev-hypervisor6` | Red Hat:enterprise_linux:6::hypervisor | All versions | 0:6.7-20160104.2.el6ev | | `rhev-hypervisor7` | Red Hat:enterprise_linux:6::hypervisor | All versions | 0:7.2-20160105.2.el6ev | | `glibc` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-common` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo-common` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-devel` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-headers` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-static` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-utils` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `nscd` | Red Hat:enterprise_linux:6::server | All versions | 0:2.12-1.166.el6_7.7 | | `glibc` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-common` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-debuginfo-common` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-devel` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-headers` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-static` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `glibc-utils` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `nscd` | Red Hat:enterprise_linux:6::workstation | All versions | 0:2.12-1.166.el6_7.7 | | `rhev-hypervisor7` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:7.2-20160105.2.el7ev | | `glibc` | Red Hat:rhel_aus:6.4::server | All versions | 0:2.12-1.107.el6_4.9 | Products: Canonical Ubuntu Linux, Debian Debian Linux, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager, F5 Big-Ip Domain Name System, F5 Big-Ip Link Controller, F5 Big-Ip Local Traffic Manager, F5 Big-Ip Policy Enforcement Manager, Gnu Glibc, Hp Helion Openstack, Hp Server Migration Pack, Opensuse Opensuse, Oracle Exalogic Infrastructure, Oracle Fujitsu M10 Firmware, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Hpc Node, Redhat Enterprise Linux Hpc Node Eus and 10 more. ## How do I fix CVE-2015-7547? Apply the vendor's patch. ## Is CVE-2015-7547 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-7547 exists. Public exploit code: - Proof of concept for CVE-2015-7547 (github_poc): https://github.com/fjserna/CVE-2015-7547 - PoC attack server for CVE-2015-7547 buffer overflow vulnerability in glibc DNS stub resolver (public version) (github_poc): https://github.com/eSentire/cve-2015-7547-public - PoC exploit server for CVE-2015-7547 (github_poc): https://github.com/jgajek/cve-2015-7547 - test script for CVE-2015-7547 (github_poc): https://github.com/cakuzo/CVE-2015-7547 - https://github.com/t0r0t0r0/CVE-2015-7547 (github_poc): https://github.com/t0r0t0r0/CVE-2015-7547 - glibc - 'getaddrinfo' Stack Buffer Overflow (PoC) (exploitdb) ## 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-2015-7547 and fix it if it is affected. What it is: CVE-2015-7547 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 18 Feb 2016. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-7547 exists. 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-2015-7547/ (Markdown: https://insights.sbomify.com/CVE-2015-7547/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7547 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7547 - OSV: https://osv.dev/vulnerability/CVE-2015-7547 --- From sbomify Insights: https://insights.sbomify.com/CVE-2015-7547/ Summaries are generated and may contain mistakes; the official description above is the record.