Auth bypass in FreeBSD
CVE-2023-49298
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.012 (65.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/openzfs/zfs/pull/15571 (Exploit, Patch, Vendor Advisory)
- github.com/openzfs/zfs/issues/15526 (Exploit, Patch, Issue Tracking, Vendor Advisory)
- bugs.freebsd.org/bugzilla/show_bug.cgi (Patch, Issue Tracking)
- news.ycombinator.com/item (Patch, Third Party Advisory)
- web.archive.org/web/20231124172959/https://www.ibm.com/support/pages/how-remove… (Third Party Advisory)
- github.com/openzfs/zfs/releases/tag/zfs-2.2.2
- github.com/openzfs/zfs/releases/tag/zfs-2.1.14
- www.theregister.com/2023/12/04/two_new_versions_of_openzfs/
- bugs.gentoo.org/917224
- news.ycombinator.com/item
Frequently asked questions
- What is CVE-2023-49298?
- CVE-2023-49298 is a high-severity vulnerability in FreeBSD, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2023-11-24.
- How severe is CVE-2023-49298?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-49298 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.