CVE-2022-27666: Buffer Overflow
First published: Tue Mar 08 2022(Updated: )
A heap buffer overflow flaw was found in IPsec ESP transformation code in net/ipv4/esp4.c and net/ipv6/esp6.c. This flaw allows a local attacker with a normal user privilege to overwrite kernel heap objects and may cause a local privilege escalation threat.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-372.13.1.rt7.170.el8_6 | 0:4.18.0-372.13.1.rt7.170.el8_6 |
| redhat/kernel | <0:4.18.0-372.13.1.el8_6 | 0:4.18.0-372.13.1.el8_6 |
| redhat/kernel | <0:4.18.0-147.67.1.el8_1 | 0:4.18.0-147.67.1.el8_1 |
| redhat/kernel-rt | <0:4.18.0-193.87.1.rt13.137.el8_2 | 0:4.18.0-193.87.1.rt13.137.el8_2 |
| redhat/kernel | <0:4.18.0-193.87.1.el8_2 | 0:4.18.0-193.87.1.el8_2 |
| redhat/kernel-rt | <0:4.18.0-305.49.1.rt7.121.el8_4 | 0:4.18.0-305.49.1.rt7.121.el8_4 |
| redhat/kernel | <0:4.18.0-305.49.1.el8_4 | 0:4.18.0-305.49.1.el8_4 |
| redhat/kernel | <0:5.14.0-70.17.1.el9_0 | 0:5.14.0-70.17.1.el9_0 |
| redhat/kernel-rt | <0:5.14.0-70.17.1.rt21.89.el9_0 | 0:5.14.0-70.17.1.rt21.89.el9_0 |
| redhat/kernel | <5.17 | 5.17 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| Linux Kernel | <5.17 | |
| Linux Kernel | =5.17 | |
| Linux Kernel | =5.17-rc1 | |
| Linux Kernel | =5.17-rc2 | |
| Linux Kernel | =5.17-rc3 | |
| Linux Kernel | =5.17-rc4 | |
| Linux Kernel | =5.17-rc5 | |
| Linux Kernel | =5.17-rc6 | |
| Linux Kernel | =5.17-rc7 | |
| Fedora | =34 | |
| Fedora | =35 | |
| Red Hat Enterprise Virtualization | =4.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| All of | ||
| netapp h300s firmware | ||
| netapp h300s | ||
| All of | ||
| NetApp H500S Firmware | ||
| netapp h500s | ||
| All of | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| All of | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| All of | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| All of | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| All of | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| All of | ||
| netapp h410c firmware | ||
| netapp h410c | ||
| Debian | =9.0 | |
| Debian | =10.0 | |
| Debian | =11.0 | |
| netapp h300s firmware | ||
| netapp h300s | ||
| NetApp H500S Firmware | ||
| netapp h500s | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| netapp h410c firmware | ||
| netapp h410c |
Remedy
The given exploit needs CAP_NET_ADMIN to set up IPsec SA and a user namespace is used to get that capability, so disabling unprivileged user namespaces gives some protection. ~~~ On non-containerized deployments of Red Hat Enterprise Linux 8, you can disable user namespaces by setting user.max_user_namespaces to 0: # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf On containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled. ~~~ Note: If the target system is already using IPsec and has SA configured, then no additional privileges are needed to exploit the issue.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2022-27666 https://nvd.nist.gov/vuln/detail/CVE-2022-27666 https://github.com/torvalds/linux/commit/ebe48d368e97d007bfeb76fcb065d6cfc4c96645
- https://bugzilla.redhat.com/show_bug.cgi?id=2061633
- https://access.redhat.com/errata/RHSA-2022:5344
- https://access.redhat.com/errata/RHSA-2022:5219
- https://access.redhat.com/errata/RHSA-2022:5316
- https://access.redhat.com/errata/RHSA-2022:4924
- https://access.redhat.com/errata/RHSA-2022:4942
- https://access.redhat.com/errata/RHSA-2022:5224
- https://access.redhat.com/errata/RHSA-2022:5220
- https://access.redhat.com/errata/RHSA-2022:5476
- https://access.redhat.com/errata/RHSA-2022:4835
- https://access.redhat.com/errata/RHSA-2022:4809
- https://access.redhat.com/errata/RHSA-2022:4829
- https://access.redhat.com/errata/RHSA-2022:5249
- https://access.redhat.com/errata/RHSA-2022:5267
- https://access.redhat.com/errata/RHSA-2022:5214
- https://access.redhat.com/errata/RHSA-2022:5678
- https://access.redhat.com/security/cve/cve-2022-27666
- https://github.com/torvalds/linux/commit/ebe48d368e97d007bfeb76fcb065d6cfc4c96645
- https://security.netapp.com/advisory/ntap-20220429-0001/
- https://www.debian.org/security/2022/dsa-5127
- https://www.debian.org/security/2022/dsa-5173
- https://launchpad.net/bugs/cve/CVE-2022-27666
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2063307
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2065568
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27666
- https://www.cve.org/CVERecord?id=CVE-2022-0886
- https://access.redhat.com/security/cve/CVE-2022-0886
- https://access.redhat.com/security/cve/CVE-2022-27666
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2061633#c16
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2067299
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2130513
- https://nvd.nist.gov/vuln/detail/CVE-2022-27666
- https://security-tracker.debian.org/tracker/CVE-2022-27666
- https://ubuntu.com/security/CVE-2022-27666
- https://git.kernel.org/linus/ebe48d368e97d007bfeb76fcb065d6cfc4c96645
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2022-27666?
CVE-2022-27666 is classified as a critical vulnerability due to its potential for local privilege escalation.
How do I fix CVE-2022-27666?
To remediate CVE-2022-27666, upgrade to kernel version 0:4.18.0-372.13.1.rt7.170.el8_6 or later for affected Red Hat distributions.
Which software is affected by CVE-2022-27666?
CVE-2022-27666 affects specific kernels including versions of Red Hat kernel and kernel-rt prior to their patched releases.
What type of vulnerability is CVE-2022-27666?
CVE-2022-27666 is a heap buffer overflow vulnerability found in IPsec ESP transformation code.
Can CVE-2022-27666 be exploited remotely?
CVE-2022-27666 is a local privilege escalation vulnerability, meaning it requires local user access to exploit.
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