CVE-2023-1829: (Pwn2Own) Canonical Ubuntu tcindex Double-Free Local Privilege Escalation Vulnerability
First published: Wed Apr 12 2023(Updated: )
A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting the underlying structure which can later lead to double freeing the structure. A local attacker user can use this vulnerability to elevate its privileges to root. We recommend upgrading past commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28.
Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <4.14.308 | |
| Linux Linux kernel | >=4.15<4.19.276 | |
| Linux Linux kernel | >=4.20<5.4.235 | |
| Linux Linux kernel | >=5.5<5.10.173 | |
| Linux Linux kernel | >=5.11<5.15.100 | |
| Linux Linux kernel | >=5.16<6.1.18 | |
| Linux Linux kernel | >=6.2<6.2.5 | |
| Canonical Ubuntu | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 |
Remedy
Block autoloading the cls_tcindex module by adding the following lines to /etc/modprobe.d/blacklist-tcindex.conf: blacklist cls_tcindex
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c710f75256bb3cf05ac7b1672c82b92c43f3d28
- https://kernel.dance/#8c710f75256bb3cf05ac7b1672c82b92c43f3d28
- https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- https://security.netapp.com/advisory/ntap-20230601-0001/
- https://www.zerodayinitiative.com/advisories/ZDI-23-898/
- https://launchpad.net/bugs/cve/CVE-2023-1829
- https://access.redhat.com/errata/RHSA-2023:4516
- https://access.redhat.com/errata/RHSA-2023:4515
- https://access.redhat.com/errata/RHSA-2023:4541
- https://access.redhat.com/errata/RHSA-2023:4517
- https://access.redhat.com/errata/RHSA-2023:4531
- https://access.redhat.com/errata/RHSA-2023:4789
- https://access.redhat.com/errata/RHSA-2023:4888
- https://access.redhat.com/errata/RHSA-2023:4961
- https://access.redhat.com/errata/RHSA-2023:4962
- https://access.redhat.com/errata/RHSA-2023:4967
- https://access.redhat.com/errata/RHSA-2023:7417
- https://access.redhat.com/errata/RHSA-2023:7431
- https://access.redhat.com/errata/RHSA-2023:7434
- https://bugzilla.redhat.com/show_bug.cgi?id=2188470
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1829
- https://nvd.nist.gov/vuln/detail/CVE-2023-1829
- https://security-tracker.debian.org/tracker/CVE-2023-1829
- https://ubuntu.com/security/CVE-2023-1829
- https://www.openwall.com/lists/oss-security/2023/04/11/3
- https://git.kernel.org/linus/8c710f75256bb3cf05ac7b1672c82b92c43f3d28
- collector/nvd-api
- collector/nvd-index
- agent/type
- agent/author
- agent/title
- collector/zdi-advisory
- source/ZDI
- alias/ZDI-23-898
- alias/ZDI-CAN-20667
- alias/CVE-2023-1829
- agent/software-canonical-lookup
- collector/launchpad-cve
- source/Launchpad
- agent/weakness
- collector/mitre-cve
- source/MITRE
- agent/severity
- collector/redhat-bugzilla
- source/Red Hat
- collector/usn-cve
- source/Ubuntu
- collector/nvd-cve
- source/NVD
- agent/remedy
- agent/references
- agent/last-modified-date
- agent/softwarecombine
- agent/tags
- agent/description
- agent/first-publish-date
- collector/security-tracker-debian
- source/Debian
- agent/event
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.15
- version/linux linux kernel/4.20
- version/linux linux kernel/5.5
- version/linux linux kernel/5.11
- version/linux linux kernel/5.16
- version/linux linux kernel/6.2
- vendor/canonical
- canonical/canonical ubuntu
- package-manager/debian