#VU49914 Path traversal in Linux kernel - CVE-2020-28374

Vulnerability identifier: #VU49914

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28374

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in drivers/target/target_core_xcopy.c in the Linux kernel. A remote user with access to iSCSI LUN can send a specially crafted XCOPY request and read or write arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: before 5.10.7, 5.10.7

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External links
https://www.openwall.com/lists/oss-security/2021/01/13/2
https://www.openwall.com/lists/oss-security/2021/01/13/5
https://bugzilla.suse.com/attachment.cgi?id=844938
https://bugzilla.suse.com/show_bug.cgi?id=1178372
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2896c93811e39d63a4d9b63ccf12a8fbc226e5e4
https://github.com/torvalds/linux/commit/2896c93811e39d63a4d9b63ccf12a8fbc226e5e4
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZEUPID5DZYLZBIO4BEVLHFUDZZIFL57/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LTGQDYIEO2GOCOOKADBHEITF44GY55QF/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.