CVE-2023-49298

Description

OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenarios involving applications that try to rely on efficient copying of file data, can replace file contents with zero-valued bytes and thus potentially disable security mechanisms. NOTE: this issue is not always security related, but can be security related in realistic situations. A possible example is cp, from a recent GNU Core Utilities (coreutils) version, when attempting to preserve a rule set for denying unauthorized access. (One might use cp when configuring access control, such as with the /etc/hosts.deny file specified in the IBM Support reference.) NOTE: this issue occurs less often in version 2.2.1, and in versions before 2.1.4, because of the default configuration in those versions.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
zfs-linux	25.10 questing	Fixed 2.2.2-0ubuntu2
	25.04 plucky	Fixed 2.2.2-0ubuntu2
	24.10 oracular	Fixed 2.2.2-0ubuntu2
	24.04 LTS noble	Fixed 2.2.2-0ubuntu2
	23.10 mantic	Fixed 2.2.0-0ubuntu1~23.10.3
	23.04 lunar	Ignored end of life, was needed
	22.04 LTS jammy	Fixed 2.1.5-1ubuntu6~22.04.4
	20.04 LTS focal	Fixed 0.8.3-1ubuntu12.17
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Ignored end of standard support

Notes

mdeslaur

This was fixed by a SRU in bug 2044657. For jammy and mantic, the packages were subsequently released in the -security pocket, but for focal, it is still in -updates, but the issue isn't seen in the focal version because of the default configuration so marking as released. No USN has been published for these updates.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
zfs-linux	Upstream: https://github.com/openzfs/zfs/pull/15571 Upstream: 77b0c6f Upstream: 9b9b09f

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N