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Fencer Vulns
medium 6.5

CVE-2023-4527 json

Glibc: stack read overflow in getaddrinfo in no-aaaa mode

published 2023-09-18 3 y ago modified 2026-11-07 43 h ago also EUVD-2023-54382

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:2.28-225.el8_8.6
  • Red Hat Red Hat Enterprise Linux 9 0:2.34-60.el9_2.7
  • glibc Debian 12 2.36-9+deb12u3
  • glibc Debian 14, Debian 13 2.37-9

debian advisories DEBIAN-CVE-2023-4527

  • glibc RHEL 9 2.34-60.el9_2.7
  • nscd RHEL 9 2.34-60.el9_2.7
  • libnsl RHEL 9 2.34-60.el9_2.7
  • nss_db RHEL 9 2.34-60.el9_2.7
  • nss_hesiod RHEL 9 2.34-60.el9_2.7
  • glibc-utils RHEL 9 2.34-60.el9_2.7
  • glibc-common RHEL 9 2.34-60.el9_2.7
  • glibc-benchtests RHEL 9 2.34-60.el9_2.7

red hat advisories RHSA-2023:5453RHSA-2023:5455

  • glibc openSUSE Tumbleweed 2.38-3.1

opensuse advisories openSUSE-SU-2024:13273-1

  • glibc AlmaLinux 9 2.34-60.el9_2.7
  • nscd AlmaLinux 9 2.34-60.el9_2.7
  • libnsl AlmaLinux 9 2.34-60.el9_2.7
  • nss_db AlmaLinux 9 2.34-60.el9_2.7
  • nss_hesiod AlmaLinux 9 2.34-60.el9_2.7
  • glibc-utils AlmaLinux 9 2.34-60.el9_2.7
  • glibc-common AlmaLinux 9 2.34-60.el9_2.7
  • glibc-benchtests AlmaLinux 9 2.34-60.el9_2.7

almalinux advisories ALSA-2023:5453ALSA-2023:5455

  • glibc Rocky Linux 8 2.28-225.el8_8.6

rocky linux advisories RLSA-2023:5455

  • glibc Azure Linux 3.0 2.38-11

azure linux advisories AZL-34732

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-4527 updated cvss 6.5

glibc: Stack read overflow in getaddrinfo in no-aaaa mode

  • Red Hat Enterprise Linux AppStream (v. 8) glibc-utils 2.28-225.el8_8.6, compat-libpthread-nonshared 2.28-225.el8_8.6
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5455
  • Red Hat Enterprise Linux AppStream (v. 9) glibc-utils 2.34-60.el9_2.7, glibc-locale-source 2.34-60.el9_2.7
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5453
  • Red Hat Enterprise Linux BaseOS (v. 8) nscd 2.28-225.el8_8.6, glibc 2.28-225.el8_8.6, libnsl 2.28-225.el8_8.6, nss_db 2.28-225.el8_8.6, glibc-common 2.28-225.el8_8.6, glibc-gconv-extra 2.28-225.el8_8.6, +3 more
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5455
  • Red Hat Enterprise Linux BaseOS (v. 9) nscd 2.34-60.el9_2.7, glibc 2.34-60.el9_2.7, libnsl 2.34-60.el9_2.7, glibc-common 2.34-60.el9_2.7, glibc-gconv-extra 2.34-60.el9_2.7, glibc-all-langpacks 2.34-60.el9_2.7, +1 more
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5453
  • Red Hat Enterprise Linux CRB (v. 8) nss_hesiod 2.28-225.el8_8.6, glibc-benchtests 2.28-225.el8_8.6
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5455
  • Red Hat Enterprise Linux CRB (v. 9) nss_db 2.34-60.el9_2.7, nss_hesiod 2.34-60.el9_2.7, glibc-benchtests 2.34-60.el9_2.7
    fixed: vendor fix “Removing the no-aaaa diagnostic option from /etc/resolv.conf will mitigate this flaw.” RHSA-2023:5453
  • Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, compat-glibc, glibc-common Red Hat Enterprise Linux 7 nscd, glibc, glibc-utils, compat-glibc, glibc-common
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-25-162-05 updated cvss 6.5

Siemens SIMATIC S7-1500 CPU family

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-166-10 updated cvss 6.5

Siemens SIMATIC S7-1500 TM MFP BIOS

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

1.67% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2234712 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.