CVE-2022-25636
First published: Tue Feb 22 2022(Updated: )
An out-of-bounds (OOB) memory access flaw was found in nft_fwd_dup_netdev_offload in net/netfilter/nf_dup_netdev.c in netfilter subcomponent in the Linux kernel due to a heap out of bounds write problem. In this flaw, an attacker with a user account on the system to gain access to out-of-bounds memory leads to a system crash or a privilege escalation threat. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git/commit/?id=b1a5983f56e371046dcf164f90bfaf704d2b89f6">https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git/commit/?id=b1a5983f56e371046dcf164f90bfaf704d2b89f6</a> <a href="https://www.openwall.com/lists/oss-security/2022/02/21/2">https://www.openwall.com/lists/oss-security/2022/02/21/2</a>
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-348.23.1.rt7.153.el8_5 | 0:4.18.0-348.23.1.rt7.153.el8_5 |
| redhat/kernel | <0:4.18.0-348.23.1.el8_5 | 0:4.18.0-348.23.1.el8_5 |
| redhat/kernel-rt | <0:4.18.0-305.45.1.rt7.117.el8_4 | 0:4.18.0-305.45.1.rt7.117.el8_4 |
| redhat/kernel | <0:4.18.0-305.45.1.el8_4 | 0:4.18.0-305.45.1.el8_4 |
| Linux Linux kernel | >=5.4<5.4.182 | |
| Linux Linux kernel | >=5.5<5.10.103 | |
| Linux Linux kernel | >=5.11<5.15.26 | |
| Linux Linux kernel | >=5.16<5.16.12 | |
| Debian Debian Linux | =11.0 | |
| Netapp Baseboard Management Controller H300e | ||
| Netapp Baseboard Management Controller H300s | ||
| Netapp Baseboard Management Controller H410c | ||
| Netapp Baseboard Management Controller H410s | ||
| Netapp Baseboard Management Controller H500e | ||
| Netapp Baseboard Management Controller H500s | ||
| Netapp Baseboard Management Controller H700e | ||
| Netapp Baseboard Management Controller H700s | ||
| Oracle Communications Cloud Native Core Binding Support Function | =22.1.3 | |
| Oracle Communications Cloud Native Core Network Exposure Function | =22.1.1 | |
| Oracle Communications Cloud Native Core Policy | =22.2.0 | |
| Netapp H300e | ||
| Netapp H300s | ||
| Netapp H410c | ||
| Netapp H410s | ||
| Netapp H500e | ||
| Netapp H500s | ||
| Netapp H700e | ||
| Netapp H700s | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
Remedy
The mitigation for the Red Hat Enterprise Linux 8 is to disable for unprivileged user possibilities of running unshare(CLONE_NEWUSER) or unshare(CLONE_NEWNET) that could be done with the next command: echo 0 > /proc/sys/user/max_user_namespaces For making this change in configuration permanent. Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable. Configure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the "/etc/sysctl.d/" directory: user.max_user_namespaces = 0 The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command: $ sudo sysctl --system The other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. For more information about seccomp, please read: https://www.openshift.com/blog/seccomp-for-fun-and-profit
Remedy
Disable unprivileged user namespaces to restrict access to privileged users (have CAP_NET_ADMIN) via the kernel.unprivileged_userns_clone sysctl: $ sudo sysctl kernel.unprivileged_userns_clone=0
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2022-25636 https://nvd.nist.gov/vuln/detail/CVE-2022-25636 https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git/commit/?id=b1a5983f56e371046dcf164f90bfaf704d2b89f6 https://www.openwall.com/lists/oss-security/2022/02/21/2
- https://bugzilla.redhat.com/show_bug.cgi?id=2056830
- https://access.redhat.com/errata/RHSA-2022:1555
- https://access.redhat.com/errata/RHSA-2022:1535
- https://access.redhat.com/errata/RHSA-2022:1550
- https://access.redhat.com/errata/RHSA-2022:1413
- https://access.redhat.com/errata/RHSA-2022:1418
- https://access.redhat.com/errata/RHSA-2022:1455
- https://access.redhat.com/errata/RHSA-2022:4896
- https://access.redhat.com/security/cve/cve-2022-25636
- http://packetstormsecurity.com/files/166444/Kernel-Live-Patch-Security-Notice-LSN-0085-1.html
- http://www.openwall.com/lists/oss-security/2022/02/22/1
- https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git/commit/?id=b1a5983f56e371046dcf164f90bfaf704d2b89f6
- https://github.com/Bonfee/CVE-2022-25636
- https://nickgregory.me/linux/security/2022/03/12/cve-2022-25636/
- https://security.netapp.com/advisory/ntap-20220325-0002/
- https://www.debian.org/security/2022/dsa-5095
- https://www.openwall.com/lists/oss-security/2022/02/21/2
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://launchpad.net/bugs/cve/CVE-2022-25636
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2056863
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2065576
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-25636
- https://nvd.nist.gov/vuln/detail/CVE-2022-25636
- https://security-tracker.debian.org/tracker/CVE-2022-25636
- https://ubuntu.com/security/CVE-2022-25636
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2022-25636
- agent/remedy
- agent/author
- agent/severity
- agent/weakness
- collector/nvd-api
- agent/software-canonical-lookup-request
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- collector/security-tracker-debian
- source/Debian
- agent/references
- agent/last-modified-date
- agent/softwarecombine
- agent/tags
- agent/description
- agent/event
- agent/trending
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/5.4
- version/linux linux kernel/5.5
- version/linux linux kernel/5.11
- version/linux linux kernel/5.16
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/11.0
- vendor/netapp
- canonical/netapp baseboard management controller h300e
- canonical/netapp baseboard management controller h300s
- canonical/netapp baseboard management controller h410c
- canonical/netapp baseboard management controller h410s
- canonical/netapp baseboard management controller h500e
- canonical/netapp baseboard management controller h500s
- canonical/netapp baseboard management controller h700e
- canonical/netapp baseboard management controller h700s
- vendor/oracle
- canonical/oracle communications cloud native core binding support function
- version/oracle communications cloud native core binding support function/22.1.3
- canonical/oracle communications cloud native core network exposure function
- version/oracle communications cloud native core network exposure function/22.1.1
- canonical/oracle communications cloud native core policy
- version/oracle communications cloud native core policy/22.2.0
- canonical/netapp h300e
- canonical/netapp h300s
- canonical/netapp h410c
- canonical/netapp h410s
- canonical/netapp h500e
- canonical/netapp h500s
- canonical/netapp h700e
- canonical/netapp h700s
- package-manager/debian