CVE-2023-4911 (GCVE-0-2023-4911)

Vulnerability from cvelistv5 – Published: 2023-10-03 17:25 – Updated: 2026-02-13 17:01
VLAI? CISA KEV
Title
Glibc: buffer overflow in ld.so leading to privilege escalation
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 variables when launching binaries with SUID permission to execute code with elevated privileges.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version
Affected: 2.34 , < 2.39 (custom)
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.28-225.el8_8.6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
    cpe:/a:redhat:enterprise_linux:8::crb
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.28-225.el8_8.6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
    cpe:/a:redhat:enterprise_linux:8::crb
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Unaffected: 0:2.28-189.6.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus:8.6::baseos
    cpe:/a:redhat:rhel_eus:8.6::appstream
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
    cpe:/a:redhat:rhel_eus:8.6::crb
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-60.el9_2.7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.34-60.el9_2.7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support Unaffected: 0:2.34-28.el9_0.4 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.0::appstream
    cpe:/o:redhat:rhel_eus:9.0::baseos
    cpe:/a:redhat:rhel_eus:9.0::crb
 Create a notification for this product.
    Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Unaffected: 0:2.28-189.6.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus:8.6::baseos
    cpe:/a:redhat:rhel_eus:8.6::appstream
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
    cpe:/a:redhat:rhel_eus:8.6::crb
 Create a notification for this product.
    Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Unaffected: 0:4.5.3-10.el8ev , < * (rpm)
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
 Create a notification for this product.
    Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Unaffected: 0:4.5.3-202312060823_8.6 , < * (rpm)
    cpe:/o:redhat:rhev_hypervisor:4.4::el8
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
Date Public ?
2023-10-03 17:00
Credits
Red Hat would like to thank Qualys Research Labs for reporting this issue.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7b65c447-ff04-4129-9281-e31ee28a0894

Vulnerability ID: CVE-2023-4911

Status: Confirmed

Status Updated: 2023-11-21 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-11-21
Asserted: 2023-11-21
Scope
Notes: KEV entry: GNU C Library Buffer Overflow Vulnerability | Affected: GNU / GNU C Library | Description: GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2023-12-12 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa, https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4911
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-122
Feed CISA Known Exploited Vulnerabilities Catalog
Product GNU C Library
Due Date 2023-12-12
Date Added 2023-11-21
Vendorproject GNU
Vulnerabilityname GNU C Library Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
To clipboard 

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          "url": "https://access.redhat.com/security/cve/CVE-2023-4911"
        },
        {
          "name": "RHBZ#2238352",
          "tags": [
            "issue-tracking",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2238352"
        },
        {
          "url": "https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt"
        },
        {
          "url": "https://www.qualys.com/cve-2023-4911/"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2023-09-04T00:00:00.000Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2023-10-03T17:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Glibc: buffer overflow in ld.so leading to privilege escalation",
      "workarounds": [
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          "lang": "en",
          "value": "For customers who cannot update immediately and do not have Secure Boot feature enabled, the issue can be mitigated using the provided SystemTap script with the following steps.  When enabled, any setuid program invoked with GLIBC_TUNABLES in the environment will be terminated immediately.  To invoke the setuid program, users will then have to unset or clear the GLIBC_TUNABLES envvar, e.g. `GLIBC_TUNABLES= sudo` . \n\nNote that these mitigation steps will need to be repeated if the system is rebooted.\n\n1)    Install required systemtap packages and dependencies as per - https://access.redhat.com/solutions/5441\n\n\n2)    Create the following systemtap script, and name it stap_block_suid_tunables.stp:\n    ~~~\nfunction has_tunable_string:long()\n{\n  name = \"GLIBC_TUNABLES\"\n\n  mm = @task(task_current())-\u003emm;\n  if (mm)\n    {\n      env_start = @mm(mm)-\u003eenv_start;\n      env_end = @mm(mm)-\u003eenv_end;\n\n      if (env_start != 0 \u0026\u0026 env_end != 0)\n        while (env_end \u003e env_start)\n          {\n            cur = user_string(env_start, \"\");\n            env_name = tokenize(cur, \"=\");\n      \n            if (env_name == name \u0026\u0026 tokenize(\"\", \"\") != \"\")\n              return 1;\n            env_start += strlen (cur) + 1\n          }\n    }\n\n  return 0;\n}\n\nprobe process(\"/lib*/ld*.so*\").function(\"__tunables_init\")\n{\n  atsecure = 0;\n  /* Skip processing if we can\u0027t read __libc_enable_secure, e.g. core dump\n     handler (systemd-cgroups-agent and systemd-coredump).  */\n  try { atsecure = @var(\"__libc_enable_secure\"); }\n  catch { printk (4, sprintf (\"CVE-2023-4911: Skipped check: %s (%d)\", execname(), pid())); }\n  if (atsecure \u0026\u0026 has_tunable_string ())\n    raise (9);\n}\n~~~\n\n3) Load the systemtap module into the running kernel:\n    ~~~\n    stap -g -F -m stap_block_suid_tunables stap_block_suid_tunables.stp\n    ~~~\n\n4) Ensure the module is loaded:\n    ~~~\n     lsmod | grep -i stap_block_suid_tunables\nstap_block_suid_tunables     249856  0\n~~~\n\n5) Once the glibc package is updated to the version containing the fix, the systemtap generated kernel module can be removed by running:\n    ~~~\n    rmmod stap_block_suid_tunables\n    ~~~\n\nIf Secure Boot is enabled on a system, the SystemTap module must be signed. An external compiling server can be used to sign the generated kernel module with a key enrolled into the kernel\u0027s keyring or starting with SystemTap 4.7 you can sign a module without a compile server. See further information here - https://www.redhat.com/sysadmin/secure-boot-systemtap"
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      "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow"
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    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2023-4911",
    "datePublished": "2023-10-03T17:25:08.434Z",
    "dateReserved": "2023-09-12T13:10:32.495Z",
    "dateUpdated": "2026-02-13T17:01:57.799Z",
    "state": "PUBLISHED"
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      "cveID": "CVE-2023-4911",
      "cwes": "[\"CWE-122\"]",
      "dateAdded": "2023-11-21",
      "dueDate": "2023-12-12",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa, https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4911  ",
      "product": "GNU C Library",
      "requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
      "shortDescription": "GNU C Library\u0027s dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.",
      "vendorProject": "GNU",
      "vulnerabilityName": "GNU C Library Buffer Overflow Vulnerability"
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When enabled, any setuid program invoked with GLIBC_TUNABLES in the environment will be terminated immediately.  To invoke the setuid program, users will then have to unset or clear the GLIBC_TUNABLES envvar, e.g. `GLIBC_TUNABLES= sudo` . \\n\\nNote that these mitigation steps will need to be repeated if the system is rebooted.\\n\\n1)    Install required systemtap packages and dependencies as per - https://access.redhat.com/solutions/5441\\n\\n\\n2)    Create the following systemtap script, and name it stap_block_suid_tunables.stp:\\n    ~~~\\nfunction has_tunable_string:long()\\n{\\n  name = \\\"GLIBC_TUNABLES\\\"\\n\\n  mm = @task(task_current())-\u003emm;\\n  if (mm)\\n    {\\n      env_start = @mm(mm)-\u003eenv_start;\\n      env_end = @mm(mm)-\u003eenv_end;\\n\\n      if (env_start != 0 \u0026\u0026 env_end != 0)\\n        while (env_end \u003e env_start)\\n          {\\n            cur = user_string(env_start, \\\"\\\");\\n            env_name = tokenize(cur, \\\"=\\\");\\n      \\n            if (env_name == name \u0026\u0026 tokenize(\\\"\\\", \\\"\\\") != \\\"\\\")\\n              return 1;\\n            env_start += strlen (cur) + 1\\n          }\\n    }\\n\\n  return 0;\\n}\\n\\nprobe process(\\\"/lib*/ld*.so*\\\").function(\\\"__tunables_init\\\")\\n{\\n  atsecure = 0;\\n  /* Skip processing if we can\u0027t read __libc_enable_secure, e.g. core dump\\n     handler (systemd-cgroups-agent and systemd-coredump).  */\\n  try { atsecure = @var(\\\"__libc_enable_secure\\\"); }\\n  catch { printk (4, sprintf (\\\"CVE-2023-4911: Skipped check: %s (%d)\\\", execname(), pid())); }\\n  if (atsecure \u0026\u0026 has_tunable_string ())\\n    raise (9);\\n}\\n~~~\\n\\n3) Load the systemtap module into the running kernel:\\n    ~~~\\n    stap -g -F -m stap_block_suid_tunables stap_block_suid_tunables.stp\\n    ~~~\\n\\n4) Ensure the module is loaded:\\n    ~~~\\n     lsmod | grep -i stap_block_suid_tunables\\nstap_block_suid_tunables     249856  0\\n~~~\\n\\n5) Once the glibc package is updated to the version containing the fix, the systemtap generated kernel module can be removed by running:\\n    ~~~\\n    rmmod stap_block_suid_tunables\\n    ~~~\\n\\nIf Secure Boot is enabled on a system, the SystemTap module must be signed. An external compiling server can be used to sign the generated kernel module with a key enrolled into the kernel\u0027s keyring or starting with SystemTap 4.7 you can sign a module without a compile server. See further information here - https://www.redhat.com/sysadmin/secure-boot-systemtap\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A buffer overflow was discovered in the GNU C Library\u0027s 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-122\", \"description\": \"Heap-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-02-05T17:25:54.427Z\"}, \"x_redhatCweChain\": \"CWE-122: Heap-based Buffer Overflow\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-4911\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-13T17:01:57.799Z\", \"dateReserved\": \"2023-09-12T13:10:32.495Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2023-10-03T17:25:08.434Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.