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Known exploited vulnerability

CVE-2023-4911

highCVSS 3.1 7.8In CISA KEVEPSS 64%Published · Red Hat

The short answer

CVE-2023-4911 affects Red Hat Red Hat Enterprise Linux 8 and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-11-21: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

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.

Weakness: CWE-122, CWE-787.

Severity

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Nov 21, 2023

Federal due date Dec 12, 2023

EPSS, next 30 days

64%

Higher than 99% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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

Affected products

Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Virtualization 4 for Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-4911 being exploited?

Yes. CISA added CVE-2023-4911 to its Known Exploited Vulnerabilities catalog on 2023-11-21, with a federal remediation due date of 2023-12-12.

How do I fix CVE-2023-4911?

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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