cve-2023-4911
Vulnerability from cvelistv5
Published
2023-10-03 17:25
Modified
2024-09-16 13:49
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Glibc: buffer overflow in ld.so leading to privilege escalation
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2023:5454Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2023:5476Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2024:0033Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2023-4911Mitigation, Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2238352Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txtExploit, Third Party Advisory
secalert@redhat.comhttps://www.qualys.com/cve-2023-4911/Third Party Advisory
Impacted products
Red HatRed Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support
Red HatRed Hat Virtualization 4 for Red Hat Enterprise Linux 8
Red HatRed Hat Virtualization 4 for Red Hat Enterprise Linux 8
Red HatRed Hat Virtualization 4 for Red Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 6
Red HatRed Hat Enterprise Linux 7
Red HatRed Hat Enterprise Linux 7
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog

Date added: 2023-11-21

Due date: 2023-12-12

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Used in ransomware: 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

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          "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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      "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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  }
}


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