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CVE-2023-4806— Glibc: potential use-after-free in getaddrinfo()

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在安全漏洞，该漏洞源于当 NSS 模块仅实现 _nss__gethostbyname2_r 挂钩而不实现 _nss__gethostbyname3_r 挂钩时，getaddrinfo 函数可能会访问已释放的内存，从而导致应用程序崩溃。

CVSS 5.9 · Medium EPSS 1.61% · P75

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 6 any unknown
any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
any affected
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 0:2.28-189.8.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 Virtualization 4 for Red Hat Enterprise Linux 8 0:2.28-189.8.el8_6< * unaffected
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I. Basic Information for CVE-2023-4806

Vulnerability Information
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Vulnerability Title
Glibc: potential use-after-free in getaddrinfo()
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
glibc 资源管理错误漏洞
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存在安全漏洞，该漏洞源于当 NSS 模块仅实现 _nss_*_gethostbyname2_r 挂钩而不实现 _nss_*_gethostbyname3_r 挂钩时，getaddrinfo 函数可能会访问已释放的内存，从而导致应用程序崩溃。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 0:2.28-189.8.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::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 0:2.34-60.el9_2.7 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:2.28-189.8.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
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-2023-4806

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III. Intelligence Information for CVE-2023-4806

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Vendor Advisories for CVE-2023-4806 (8)

Mailing List Discussions for CVE-2023-4806 (7)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-416

V. Comments for CVE-2023-4806

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