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CVE-2023-4911— Glibc: buffer overflow in ld.so leading to privilege escalation

Quick assessment

Affected
CVE-2023-4911
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

glibc（GNU C Library）是GNU计划所实现的C标准库。 glibc存在缓冲区错误漏洞，该漏洞源于动态加载程序ld.so存在缓冲区溢出漏洞。

CVSS 7.8 · High KEV EPSS 63.77% · P99

Public Exploits 2

ExploitDB · 1 EDB-52479 [local]
Metasploit · 1 glibc_tunables_priv_esc.rb [exploit]

Affected Version Matrix 13

VendorProduct Version RangeStatus
None None 2.34< 2.39 affected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6< * unaffected
0:2.28-225.el8_8.6< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:2.28-189.6.el8_6< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:2.34-60.el9_2.7< * unaffected
0:2.34-60.el9_2.7< * unaffected
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:2.34-28.el9_0.4< * unaffected
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:2.28-189.6.el8_6< * unaffected
0:4.5.3-10.el8ev< * unaffected
0:4.5.3-202312060823_8.6< * unaffected

I. Basic Information for CVE-2023-4911

Vulnerability Information
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Vulnerability Title
Glibc: buffer overflow in ld.so leading to privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
glibc 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
glibc（GNU C Library）是GNU计划所实现的C标准库。 glibc存在缓冲区错误漏洞，该漏洞源于动态加载程序ld.so存在缓冲区溢出漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 2.34 ~ 2.39 -
Red Hat Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:2.28-189.6.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 9 0:2.34-60.el9_2.7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.34-60.el9_2.7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:2.34-28.el9_0.4 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:2.28-189.6.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.5.3-10.el8ev ~ * cpe:/o:redhat:rhev_hypervisor:4.4::el8
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.5.3-202312060823_8.6 ~ * cpe:/o:redhat:rhev_hypervisor:4.4::el8
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7

II. Public POCs for CVE-2023-4911

# POC Description Source Link Shenlong Link
1 https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt https://github.com/Green-Avocado/CVE-2023-4911 POC Details
2 PoC for CVE-2023-4911 https://github.com/leesh3288/CVE-2023-4911 POC Details
3 CVE-2023-4911 proof of concept https://github.com/RickdeJager/CVE-2023-4911 POC Details
4 None https://github.com/xiaoQ1z/CVE-2023-4911 POC Details
5 CVE-2023-4911 https://github.com/silent6trinity/looney-tuneables POC Details
6 None https://github.com/hadrian3689/looney-tunables-CVE-2023-4911 POC Details
7 CVE-2023-4911 https://github.com/ruycr4ft/CVE-2023-4911 POC Details
8 PoC for CVE-2023-4911 LooneyTuneables https://github.com/guffre/CVE-2023-4911 POC Details
9 Exploit tool for CVE-2023-4911, targeting the 'Looney Tunables' glibc vulnerability in various Linux distributions. https://github.com/chaudharyarjun/LooneyPwner POC Details
10 Looney Tunables Local privilege escalation (CVE-2023-4911) workshop https://github.com/KernelKrise/CVE-2023-4911 POC Details
11 Proof of concept for CVE-2023-4911 (Looney Tunables) discovered by Qualys Threat Research Unit https://github.com/Diego-AltF4/CVE-2023-4911 POC Details
12 Looney Tunables CVE-2023-4911 https://github.com/teraGL/looneyCVE POC Details
13 PoC of CVE-2023-4911 https://github.com/snurkeburk/Looney-Tunables POC Details
14 None https://github.com/puckiestyle/CVE-2023-4911 POC Details
15 None https://github.com/yanfernandess/Looney-Tunables-CVE-2023-4911 POC Details
16 Repository containing a Proof of Concept (PoC) demonstrating the impact of CVE-2023-4911, a vulnerability in glibc's ld.so dynamic loader, exposing risks related to Looney Tunables. https://github.com/NishanthAnand21/CVE-2023-4911-PoC POC Details
17 PoC for CVE-2023-4911 https://github.com/xem6/CVE-2023-4911 POC Details
18 CVE-2023-4911-Looney-Tunables https://github.com/Billar42/CVE-2023-4911 POC Details
19 None https://github.com/dungNHVhust/CVE-2023-4911 POC Details
20 CVE-2023-4911 exploit https://github.com/shacojx/CVE-2023-4911-Exploit POC Details
21 None https://github.com/KillReal01/CVE-2023-4911 POC Details
22 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/code/cves/2023/CVE-2023-4911.yaml POC Details
23 None https://github.com/RRespxwnss/Looney-Tunables-CVE-2023-4911 POC Details
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III. Intelligence Information for CVE-2023-4911

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Vendor Advisories for CVE-2023-4911 (11)

Exploits & Public PoCs for CVE-2023-4911 (2)

Mailing List Discussions for CVE-2023-4911 (8)

Other References for CVE-2023-4911 (2)

IV. Related Vulnerabilities

Same weakness: CWE-122

V. Comments for CVE-2023-4911

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