kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints
Published Oct 13, 2020
7.5
HIGHCVSS 3.1
EPSS 2.43%
Description
A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.
Affected products
- Vendor n/a Product Kernel Defaultn/a
- Version Linux kernel versions before 5.9-rc7StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Kernel | n/a |
|
Configuration 1
- < 5.9.0
- 5.9.0
- 5.9.0
- 5.9.0
- 5.9.0
- 5.9.0
- 5.9.0
- 5.9.0
Configuration 2
- 9.0
- 10.0
Configuration 3
- n/a
- n/a
Configuration 5
- n/a
Running on/with
- n/a
Configuration 6
- 14.04
- 16.04
- 18.04
- 20.04
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-1160.21.1.el7
Fixed · RHSA-2021:0856
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-1160.21.1.rt56.1158.el7
Fixed · RHSA-2021:0857
Red Hat Enterprise Linux 8
kernel-0:4.18.0-305.el8
Fixed · RHSA-2021:1578
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Will not fix
Red Hat Enterprise Linux 8
kernel-rt
Affected
Red Hat Enterprise MRG 2
kernel-rt
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-1160.21.1.el7 | Fixed | RHSA-2021:0856 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-1160.21.1.rt56.1158.el7 | Fixed | RHSA-2021:0857 |
| Red Hat Enterprise Linux 8 | kernel-0:4.18.0-305.el8 | Fixed | RHSA-2021:1578 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
A possible workaround for this flaw is to configure IPsec for all traffic between the endpoints, instead of specifically for the UDP port used by the GENEVE tunnels. If GENEVE tunnels are not used, this flaw will not be triggered. In that case, it is possible to disable those tunnels, by unloading the "geneve" kernel module and blacklisting it (See https://access.redhat.com/solutions/41278 for a guide on how to blacklist modules).
References (12)
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html x_refsource_MISCThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2020-25645 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1883988 x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-18310 Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-25645
- https://security.netapp.com/advisory/ntap-20201103-0004/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2020-25645
- https://www.debian.org/security/2020/dsa-4774 vendor-advisoryx_refsource_DEBIANThird Party Advisory
Change history (0)
No recorded changes yet.