CVE-2023-2295

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Description

A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is received with only unacceptable crypto algorithms, and the response packet is not sent with a zero responder SPI. When a subsequent packet is received where the sender reuses the libreswan responder SPI as its own initiator SPI, the pluto daemon state machine crashes. No remote code execution is possible. This CVE exists because of a CVE-2023-30570 security regression for libreswan package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.

A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is received with only unacceptable crypto algorithms, and the response packet is not sent with a zero responder SPI. When a subsequent packet is received where the sender reuses the libreswan responder SPI as its own initiator SPI, the pluto daemon state machine crashes. No remote code execution is possible. This CVE exists because of a CVE-2023-30570 security regression for libreswan package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.

Statement

This issue only affects Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2, which introduced this regression via the following errata: https://access.redhat.com/errata/RHBA-2023:2865 (Red Hat Enterprise Linux 8.8) https://access.redhat.com/errata/RHBA-2023:2355 (Red Hat Enterprise Linux 9.2) These errata provided updates for libreswan package, but did not include fixes for CVE-2023-30570. A user who installs or updates to Red Hat Enterprise Linux 8.8 or Red Hat Enterprise Linux 9.2 would be vulnerable to the CVE-2023-30570, even if they were properly fixed in Red Hat Enterprise Linux 8.7 and Red Hat Enterprise Linux 9.1. The CVE-2023-2295 was assigned to that Red Hat specific security regression and it is not applicable to any upstream libreswan version or libreswan packages of any other vendor that are not directly based on Red Hat Enterprise Linux packages. For more details about the original security issue CVE-2023-30570, refer to the CVE page: https://access.redhat.com/security/cve/CVE-2023-30570.

This issue only affects Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2, which introduced this regression via the following errata:

https://access.redhat.com/errata/RHBA-2023:2865 (Red Hat Enterprise Linux 8.8) https://access.redhat.com/errata/RHBA-2023:2355 (Red Hat Enterprise Linux 9.2)

These errata provided updates for libreswan package, but did not include fixes for CVE-2023-30570.

A user who installs or updates to Red Hat Enterprise Linux 8.8 or Red Hat Enterprise Linux 9.2 would be vulnerable to the CVE-2023-30570, even if they were properly fixed in Red Hat Enterprise Linux 8.7 and Red Hat Enterprise Linux 9.1. The CVE-2023-2295 was assigned to that Red Hat specific security regression and it is not applicable to any upstream libreswan version or libreswan packages of any other vendor that are not directly based on Red Hat Enterprise Linux packages.

For more details about the original security issue CVE-2023-30570, refer to the CVE page: https://access.redhat.com/security/cve/CVE-2023-30570.

Additional information

  • Bugzilla 2189777: libreswan: Regression of CVE-2023-30570 fixes in the Red Hat Enterprise Linux
  • CWE-400: Uncontrolled Resource Consumption
  • FAQ: Frequently asked questions about CVE-2023-2295

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

7.5

7.5

Attack Vector

Network

Network

Attack Complexity

Low

Low

Privileges Required

None

None

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

None

None

Integrity Impact

None

None

Availability Impact

High

High

CVSS v3 Vector

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

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

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

For open source software shipped by multiple vendors, the CVSS base scores may vary for each vendor's version depending on the version they ship, how they ship it, the platform, and even how the software is compiled. This makes scoring of vulnerabilities difficult for third-party vulnerability databases such as NVD that only provide a single CVSS base score for each vulnerability. Red Hat scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

  • "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
  • "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future.

What can I do if my product is listed as "Will not fix"?

A "will not fix" status means that a fix for an affected product version is not planned or not possible due to complexity, which may create additional risk.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
  • Apply a mitigation (if one exists).
  • Open a support case to request a prioritization of releasing a fix for this vulnerability.

What can I do if my product is listed as "Fix deferred"?

A deferred status means that a fix for an affected product version is not guaranteed due to higher-priority development work.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Apply a mitigation (if one exists).
  • Open a support case to request a prioritization of releasing a fix for this vulnerability.
  • Red Hat Engineering focuses on addressing high-priority issues based on their complexity or limited lifecycle support. Therefore, lower-priority issues will not receive immediate fixes.

What is a mitigation?

A mitigation is an action that can be taken to reduce the impact of a security vulnerability, without deploying any fixes.

I have a Red Hat product but it is not in the above list, is it affected?

The listed products were found to include one or more of the components that this vulnerability affects. These products underwent a thorough evaluation to determine their affectedness by this vulnerability. Note that layered products (such as container-based offerings) that consume affected components from any of the products listed in this table may be affected and are not represented.

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

In order to maintain code stability and compatibility, Red Hat usually does not rebase packages to entirely new versions. Instead, we backport fixes and new features to an older version of the package we distribute. This can result in some security scanners that only consider the package version to report the package as vulnerable. To avoid this, we suggest that you use an approved vulnerability scanner from our Red Hat Vulnerability Scanner Certification program.

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