--- id: CVE-2023-4911 title: >- A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable summary: >- A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variable… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-122 - CWE-787 vendor: gnu product: glibc affected: - bootstrap_os - simatic_s7-1500_cpu_1518-4_pn/dp_mfp_firmware >= 3.1.5 - simatic_s7-1500_cpu_1518f-4_pn/dp_mfp_firmware >= 3.1.5 - siplus_s7-1500_cpu_1518-4_pn/dp_mfp_firmware >= 3.1.5 - simatic_s7-1500_tm_mfp_firmware < 1.1 - 'glibc >= 2.34, < 2.39' - fedora = 37 - fedora = 38 - fedora = 39 - codeready_linux_builder = 9.0 - codeready_linux_builder_eus = 8.6 - codeready_linux_builder_eus = 9.2 - codeready_linux_builder_eus = 9.4 - codeready_linux_builder_eus = 9.6 - codeready_linux_builder_for_arm64 = 9.0_aarch64 - codeready_linux_builder_for_arm64_eus = 8.6 - codeready_linux_builder_for_arm64_eus = 9.2_aarch64 - codeready_linux_builder_for_arm64_eus = 9.4_aarch64 - codeready_linux_builder_for_arm64_eus = 9.6_aarch64 - codeready_linux_builder_for_ibm_z_systems = 9.0_s390x - codeready_linux_builder_for_ibm_z_systems_eus = 8.6 - codeready_linux_builder_for_ibm_z_systems_eus = 9.2_s390x - codeready_linux_builder_for_ibm_z_systems_eus = 9.4_s390x - codeready_linux_builder_for_ibm_z_systems_eus = 9.6_s390x - codeready_linux_builder_for_power_little_endian = 9.0_ppc64le - codeready_linux_builder_for_power_little_endian_eus = 8.6 - codeready_linux_builder_for_power_little_endian_eus = 9.2_ppc64le - codeready_linux_builder_for_power_little_endian_eus = 9.4_ppc64le - codeready_linux_builder_for_power_little_endian_eus = 9.6_ppc64le - virtualization = 4.0 - virtualization_host = 4.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux_eus = 8.6 - enterprise_linux_eus = 9.2 - enterprise_linux_eus = 9.4 - enterprise_linux_eus = 9.6 - enterprise_linux_for_arm_64 = 9.0_aarch64 - enterprise_linux_for_arm_64_eus = 8.6_aarch64 - enterprise_linux_for_arm_64_eus = 9.2_aarch64 - enterprise_linux_for_arm_64_eus = 9.4_aarch64 - enterprise_linux_for_arm_64_eus = 9.6_aarch64 - enterprise_linux_for_ibm_z_systems = 9.0_s390x - enterprise_linux_for_ibm_z_systems_eus = 9.2_s390x - enterprise_linux_for_ibm_z_systems_eus = 9.4_s390x - enterprise_linux_for_ibm_z_systems_eus = 9.6_s390x - enterprise_linux_for_ibm_z_systems_eus_s390x = 8.6 - enterprise_linux_for_power_big_endian_eus = 8.6_ppc64le - enterprise_linux_for_power_little_endian = 9.0_ppc64le - enterprise_linux_for_power_little_endian_eus = 9.2_ppc64le - enterprise_linux_for_power_little_endian_eus = 9.4_ppc64le - enterprise_linux_for_power_little_endian_eus = 9.6_ppc64le - enterprise_linux_server_aus = 8.6 - enterprise_linux_server_aus = 9.2 - enterprise_linux_server_aus = 9.4 - enterprise_linux_server_aus = 9.6 - >- enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2_ppc64le - >- enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.4_ppc64le - >- enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.6_ppc64le - enterprise_linux_server_tus = 8.6 - enterprise_linux_update_services_for_sap_solutions = 9.2 - enterprise_linux_update_services_for_sap_solutions = 9.4 - enterprise_linux_update_services_for_sap_solutions = 9.6 - ubuntu_linux = 22.04 - ubuntu_linux = 23.04 - debian_linux = 11.0 - debian_linux = 12.0 - h410c_firmware - h300s_firmware - h500s_firmware - h700s_firmware - h410s_firmware - ontap_select_deploy_administration_utility patched: - simatic_s7-1500_tm_mfp_firmware 1.1 - glibc 2.39 published: '2023-10-03' updated: '2026-10-14' sourceUpdated: '2026-10-14T22:17:18.373' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4911' references: - url: 'https://access.redhat.com/errata/RHSA-2023:5453' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:5454' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:5455' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2023:5476' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2024:0033' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2023-4911' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2238352' label: secalert@redhat.com - url: >- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt label: secalert@redhat.com - url: 'https://www.qualys.com/cve-2023-4911/' label: secalert@redhat.com - url: >- http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html label: af854a3a-2127-422b-91ae-364da2661108 - url: >- http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://seclists.org/fulldisclosure/2023/Oct/11' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/2' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/03/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/05/1' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/13/11' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/14/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/14/5' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2023/10/14/6' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5453' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5454' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5455' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2023:5476' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0033' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/security/cve/CVE-2023-4911' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2238352' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.gentoo.org/glsa/202310-03' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20231013-0006/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2023/dsa-5514' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.exploit-db.com/exploits/52479' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.qualys.com/cve-2023-4911/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-831302.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: >- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911 label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 tags: - nvd - kev - in-the-wild - exploit-available - cve.org epss: 0.63769 epssPercentile: 0.99214 kev: true kevDateAdded: '2023-11-21' kevDueDate: '2023-12-12' kevRansomware: false exploited: true exploits: exploitdb: true github: 21 githubRepos: - 'https://github.com/Green-Avocado/CVE-2023-4911' - 'https://github.com/leesh3288/CVE-2023-4911' - 'https://github.com/RickdeJager/CVE-2023-4911' metasploit: - exploit/linux/local/glibc_tunables_priv_esc checkedAt: '2026-10-14T23:00:36.689Z' exploitAvailable: true ingestedAt: '2026-10-14T23:00:02.005Z' ssvc: exploitation: active automatable: 'no' technicalImpact: total timestamp: '2025-10-15T19:45:35.724824Z' --- ## Overview A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges. ## Affected - `bootstrap_os` - `simatic_s7-1500_cpu_1518-4_pn/dp_mfp_firmware >= 3.1.5` - `simatic_s7-1500_cpu_1518f-4_pn/dp_mfp_firmware >= 3.1.5` - `siplus_s7-1500_cpu_1518-4_pn/dp_mfp_firmware >= 3.1.5` - `simatic_s7-1500_tm_mfp_firmware < 1.1` - `glibc >= 2.34, < 2.39` - `fedora = 37` - `fedora = 38` - `fedora = 39` - `codeready_linux_builder = 9.0` - `codeready_linux_builder_eus = 8.6` - `codeready_linux_builder_eus = 9.2` - `codeready_linux_builder_eus = 9.4` - `codeready_linux_builder_eus = 9.6` - `codeready_linux_builder_for_arm64 = 9.0_aarch64` - `codeready_linux_builder_for_arm64_eus = 8.6` - `codeready_linux_builder_for_arm64_eus = 9.2_aarch64` - `codeready_linux_builder_for_arm64_eus = 9.4_aarch64` - `codeready_linux_builder_for_arm64_eus = 9.6_aarch64` - `codeready_linux_builder_for_ibm_z_systems = 9.0_s390x` - `codeready_linux_builder_for_ibm_z_systems_eus = 8.6` - `codeready_linux_builder_for_ibm_z_systems_eus = 9.2_s390x` - `codeready_linux_builder_for_ibm_z_systems_eus = 9.4_s390x` - `codeready_linux_builder_for_ibm_z_systems_eus = 9.6_s390x` - `codeready_linux_builder_for_power_little_endian = 9.0_ppc64le` - `codeready_linux_builder_for_power_little_endian_eus = 8.6` - `codeready_linux_builder_for_power_little_endian_eus = 9.2_ppc64le` - `codeready_linux_builder_for_power_little_endian_eus = 9.4_ppc64le` - `codeready_linux_builder_for_power_little_endian_eus = 9.6_ppc64le` - `virtualization = 4.0` - `virtualization_host = 4.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux_eus = 8.6` - `enterprise_linux_eus = 9.2` - `enterprise_linux_eus = 9.4` - `enterprise_linux_eus = 9.6` - `enterprise_linux_for_arm_64 = 9.0_aarch64` - `enterprise_linux_for_arm_64_eus = 8.6_aarch64` - `enterprise_linux_for_arm_64_eus = 9.2_aarch64` - `enterprise_linux_for_arm_64_eus = 9.4_aarch64` - `enterprise_linux_for_arm_64_eus = 9.6_aarch64` - `enterprise_linux_for_ibm_z_systems = 9.0_s390x` - `enterprise_linux_for_ibm_z_systems_eus = 9.2_s390x` - `enterprise_linux_for_ibm_z_systems_eus = 9.4_s390x` - `enterprise_linux_for_ibm_z_systems_eus = 9.6_s390x` - `enterprise_linux_for_ibm_z_systems_eus_s390x = 8.6` - `enterprise_linux_for_power_big_endian_eus = 8.6_ppc64le` - `enterprise_linux_for_power_little_endian = 9.0_ppc64le` - `enterprise_linux_for_power_little_endian_eus = 9.2_ppc64le` - `enterprise_linux_for_power_little_endian_eus = 9.4_ppc64le` - `enterprise_linux_for_power_little_endian_eus = 9.6_ppc64le` - `enterprise_linux_server_aus = 8.6` - `enterprise_linux_server_aus = 9.2` - `enterprise_linux_server_aus = 9.4` - `enterprise_linux_server_aus = 9.6` - `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2_ppc64le` - `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.4_ppc64le` - `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.6_ppc64le` - `enterprise_linux_server_tus = 8.6` - `enterprise_linux_update_services_for_sap_solutions = 9.2` - `enterprise_linux_update_services_for_sap_solutions = 9.4` - `enterprise_linux_update_services_for_sap_solutions = 9.6` - `ubuntu_linux = 22.04` - `ubuntu_linux = 23.04` - `debian_linux = 11.0` - `debian_linux = 12.0` - `h410c_firmware` - `h300s_firmware` - `h500s_firmware` - `h700s_firmware` - `h410s_firmware` - `ontap_select_deploy_administration_utility` ## Remediation Upgrade past the affected range: - `simatic_s7-1500_tm_mfp_firmware 1.1` - `glibc 2.39`