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archlinuxArchLinuxASA-202101-30
HistoryJan 20, 2021 - 12:00 a.m.

[ASA-202101-30] linux-lts: directory traversal

2021-01-2000:00:00
security.archlinux.org
96

5.5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:S/C:P/I:P/A:N

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

0.004 Low

EPSS

Percentile

72.9%

Arch Linux Security Advisory ASA-202101-30

Severity: Medium
Date : 2021-01-20
CVE-ID : CVE-2020-28374
Package : linux-lts
Type : directory traversal
Remote : No
Link : https://security.archlinux.org/AVG-1445

Summary

The package linux-lts before version 5.4.89-1 is vulnerable to
directory traversal.

Resolution

Upgrade to 5.4.89-1.

pacman -Syu β€œlinux-lts>=5.4.89-1”

The problem has been fixed upstream in version 5.4.89.

Workaround

None.

Description

In drivers/target/target_core_xcopy.c in the Linux kernel before
5.10.7, insufficient identifier checking in the LIO SCSI target code
can be used by remote attackers to read or write files via directory
traversal in an XCOPY request, aka CID-2896c93811e3. For example, an
attack can occur over a network if the attacker has access to one iSCSI
LUN. The attacker gains control over file access because I/O operations
are proxied via an attacker-selected backstore.

Impact

An attacker can traverse directories on the system through malicious
operations.

References

https://www.openwall.com/lists/oss-security/2021/01/12/12
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.7&id=6f1e88527c1869de08632efa2cc796e0131850dc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.4.89&id=485e21729b1e1235e6075318225c09e76b376e81
https://security.archlinux.org/CVE-2020-28374

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanylinux-lts<Β 5.4.89-1UNKNOWN

5.5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:S/C:P/I:P/A:N

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

0.004 Low

EPSS

Percentile

72.9%