CVE-2023-49298

Published: 24 November 2023

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.

Notes

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.

Status

Severity score breakdown

References

• https://news.ycombinator.com/item?id=38405731
• https://web.archive.org/web/20231124172959/https://www.ibm.com/support/pages/how-remove-missing%C2%A0newline%C2%A0or%C2%A0line%C2%A0too%C2%A0long-error-etchostsallow%C2%A0and%C2%A0etchostsdeny-files
• https://github.com/openzfs/zfs/releases/tag/zfs-2.2.2
• https://gist.github.com/rincebrain/e23b4a39aba3fadc04db18574d30dc73
• https://www.cve.org/CVERecord?id=CVE-2023-49298
• NVD
• Launchpad
• Debian

Bugs

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056752
• https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275308
• https://github.com/openzfs/zfs/issues/15526
• https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/2044657