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CVE-2024-3094

Public on

Last Modified: UTC

CriticalCritical ImpactWhat does this mean?
10.0CVSS Score Breakdown


DESCRIPTION

Malicious code was discovered in the upstream tarballs of xz, starting with
version 5.6.0. Through a series of complex obfuscations, the liblzma build
process extracts a prebuilt object file from a disguised test file existing in
the source code, which is then used to modify specific functions in the liblzma
code. This results in a modified liblzma library that can be used by any
software linked against this library, intercepting and modifying the data
interaction with this library.

Malicious code was discovered in the upstream tarballs of xz, starting with
version 5.6.0. Through a series of complex obfuscations, the liblzma build
process extracts a prebuilt object file from a disguised test file existing in
the source code, which is then used to modify specific functions in the liblzma
code. This results in a modified liblzma library that can be used by any
software linked against this library, intercepting and modifying the data
interaction with this library.


STATEMENT

Current investigation indicates that the packages are only present in Fedora 41
and Fedora Rawhide within the Red Hat community ecosystem. No versions of Red
Hat Enterprise Linux (RHEL) are affected. The malicious injection present in the
xz versions 5.6.0 and 5.6.1 libraries is only included in the tarball download
package. The Git distribution lacks the M4 macro that triggers the build of the
malicious code. The second-stage artifacts are present in the Git repository for
the injection during the build time, in case the malicious M4 macro is present.
Without the merge into the build, the 2nd-stage file is innocuous. In the
finder’s demonstration, it was found that it interfered with the OpenSSH daemon.
While OpenSSH is not directly linked to the liblzma library, it does communicate
with systemd in such a way that exposes it to the malware due to systemd linking
to liblzma.

Current investigation indicates that the packages are only present in Fedora 41
and Fedora Rawhide within the Red Hat community ecosystem.

No versions of Red Hat Enterprise Linux (RHEL) are affected.

The malicious injection present in the xz versions 5.6.0 and 5.6.1 libraries is
only included in the tarball download package. The Git distribution lacks the M4
macro that triggers the build of the malicious code. The second-stage artifacts
are present in the Git repository for the injection during the build time, in
case the malicious M4 macro is present. Without the merge into the build, the
2nd-stage file is innocuous. In the finder’s demonstration, it was found that it
interfered with the OpenSSH daemon. While OpenSSH is not directly linked to the
liblzma library, it does communicate with systemd in such a way that exposes it
to the malware due to systemd linking to liblzma.


ADDITIONAL INFORMATION

 * Bugzilla 2272210: xz: malicious code in distributed source
 * CWE-506: Embedded Malicious Code
 * FAQ: Frequently asked questions about CVE-2024-3094




EXTERNAL REFERENCES

 * https://www.cve.org/CVERecord?id=CVE-2024-3094

 * https://nvd.nist.gov/vuln/detail/CVE-2024-3094

 * https://www.openwall.com/lists/oss-security/2024/03/29/4

 * https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users




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).

The following CVSS metrics and score provided are preliminary and subject to
review.

CVSS v3 Score BreakdownRed HatNVD

CVSS v3 Base Score

10.0

N/A

Attack Vector

Network

N/A

Attack Complexity

Low

N/A

Privileges Required

None

N/A

User Interaction

None

N/A

Scope

Changed

N/A

Confidentiality Impact

High

N/A

Integrity Impact

High

N/A

Availability Impact

High

N/A




CVSS V3 VECTOR

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


ACKNOWLEDGEMENTS

Red Hat would like to thank Andres Freund for reporting this issue.


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"?

This depends mostly on the Impact of the vulnerability and the Life Cycle phase
in which your product is currently in. 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 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.

Not sure what something means? Check out our Security Glossary.

This page is generated automatically and has not been checked for errors or
omissions.

For clarification or corrections please contact Red Hat Product Security.

Last Modified: UTC

CVE description copyright © 2021



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