CyberSecBulletin
CVE-2023-3758NVD status: Modified

Red Hat Enterprise Linux 8: Concurrent Execution using Shared Resource with Improper Synchronization

Published Updated By the CyberSecBulletin desk

CVE-2023-3758 is a high-severity concurrent execution using shared resource with improper synchronization vulnerability in Red Hat Enterprise Linux 8 from Red Hat, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited from the same local network by an attacker with a low-privileged account, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.04% chance of exploitation within 30 days, higher than 65% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Sssd to 2.9.5 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
Red HatRed Hat Enterprise Linux 8Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8.6 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8.8 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.0 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.2 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Virtualization 4 for Red Hat Enterprise Linux 8Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 6Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 7Not specified in the recordNot stated
Fedora ProjectSssdbefore 2.9.52.9.5
Red HatCodeready Linux Builder8.0Not stated
Red HatCodeready Linux Builder EUS8.6; 8.8; 9.0; 9.2; 9.4; 9.6Not stated
Red HatCodeready Linux Builder For Arm648.0_aarch64Not stated
Red HatCodeready Linux Builder For Arm64 EUS8.6_aarch64; 8.8_aarch64; 9.0_aarch64; 9.2_aarch64; 9.4_aarch64; 9.6_aarch64Not stated
Red HatCodeready Linux Builder For IBM Z Systems8.0_s390xNot stated
Red HatCodeready Linux Builder For IBM Z Systems EUS8.6_s390x; 8.8_s390x; 9.0_s390x; 9.2_s390x; 9.4_s390x; 9.6_s390xNot stated
Red HatCodeready Linux Builder For Power Little Endian8.0_ppc64leNot stated
Red HatCodeready Linux Builder For Power Little Endian EUS8.6_ppc64le; 8.8_ppc64le; 9.0_ppc64le; 9.2_ppc64le; 9.4_ppc64le; 9.6_ppc64leNot stated
Red HatVirtualization Host4.0Not stated
Red HatEnterprise Linux8.0Not stated
Red HatEnterprise Linux EUS8.6; 8.8; 9.0; 9.2; 9.4; 9.6Not stated
Red HatEnterprise Linux For Arm 648.0_aarch64Not stated
Red HatEnterprise Linux For Arm 64 EUS8.6_aarch64; 8.8_aarch64; 9.0_aarch64; 9.2_aarch64; 9.4_aarch64; 9.6_aarch64Not stated
Red HatEnterprise Linux For IBM Z Systems8.0_s390xNot stated
Red HatEnterprise Linux For IBM Z Systems EUS8.6_s390x; 8.8_s390x; 9.0_s390x; 9.2_s390x; 9.4_s390x; 9.6_s390xNot stated

Version data comes from the organisation that assigned the CVE; 7 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (redhat.com).

Scoring systemScoreSeverityScored by
CVSS 3.17.1HighCNA (redhat.com)
CVSS 3.17.1HighCISA (ADP)

Official description

A race condition flaw was found in sssd where the GPO policy is not consistently applied for authenticated users. This may lead to improper authorization issues, granting or denying access to resources inappropriately.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Concurrent Execution using Shared Resource with Improper Synchronization

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

How developers prevent this class of flaw

  • In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
  • Use thread-safe capabilities such as the data access abstraction in Spring.
  • Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring. Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).

More Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities (CWE-362)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Patches and release notes

Third-party and government advisories

Other vulnerabilities in Red Hat Enterprise Linux 8

All Red Hat Enterprise Linux 8 vulnerabilities

Recent Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities

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