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CVE-2023-4527— Glibc: stack read overflow in getaddrinfo in no-aaaa mode

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，该漏洞源于当使用 AF_UNSPEC 地址族调用 getaddrinfo 函数并且通过 /etc/resolv.conf 配置为 no-aaaa 模式时， TCP 大于 2048 字节的 DNS 响应可能会通过函数返回的地址数据泄露堆栈内容， 并可能导致崩溃。

CVSS 6.5 · Medium EPSS 1.67% · P76

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 6 any unaffected
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 9 0:2.34-60.el9_2.7< * unaffected
0:2.34-60.el9_2.7< * unaffected
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I. Basic Information for CVE-2023-4527

Vulnerability Information
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Vulnerability Title
Glibc: stack read overflow in getaddrinfo in no-aaaa mode
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
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存在安全漏洞，该漏洞源于当使用 AF_UNSPEC 地址族调用 getaddrinfo 函数并且通过 /etc/resolv.conf 配置为 no-aaaa 模式时， TCP 大于 2048 字节的 DNS 响应可能会通过函数返回的地址数据泄露堆栈内容， 并可能导致崩溃。
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:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6 ~ * cpe:/o:redhat:enterprise_linux:8::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 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-2023-4527

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III. Intelligence Information for CVE-2023-4527

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Vendor Advisories for CVE-2023-4527 (6)

Mailing List Discussions for CVE-2023-4527 (4)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-121

V. Comments for CVE-2023-4527

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