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CVE-2021-3139

8.1 · HIGH

In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy_locate_udev in tcmur_cmd_handler.c lacks a check for transport-layer restrictions, allowing remote attackers to read or write…

Published Jan 13, 2021CWE-22EPSS 2.68%

Overview

CVE-2021-3139 is a high-severity vulnerability. It was published on January 13, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In Open-iSCSI tcmu-runner 1.3.x, 1.4.x, and 1.5.x through 1.5.2, xcopy_locate_udev in tcmur_cmd_handler.c lacks a check for transport-layer restrictions, allowing remote attackers to read or write files via directory traversal in an XCOPY request. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. NOTE: relative to CVE-2020-28374, this is a similar mistake in a different algorithm.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2021/01/13/5Refbugzilla.suse.com/attachment.cgi?id=844938Refbugzilla.suse.com/show_bug.cgi?id=1178372GitHubgithub.com/open-iscsi/tcmu-runner/pull/644Refwww.openwall.com/lists/oss-security/2021/01/12/12Refwww.openwall.com/lists/oss-security/2021/01/13/5Refbugzilla.suse.com/attachment.cgi?id=844938Refbugzilla.suse.com/show_bug.cgi?id=1178372GitHubgithub.com/open-iscsi/tcmu-runner/pull/644Refwww.openwall.com/lists/oss-security/2021/01/12/12

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3139?

CVE-2021-3139 is a high-severity vulnerability. It was published on January 13, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-3139?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3139?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3139?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3139 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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