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Fencer Vulns
medium 6.5

CVE-2021-4024 json

Exposure of Sensitive Information to an Unauthorized Actor and Origin Validation Error in podman

published 2021-12-23 4 y ago modified 2026-06-17 4 mo ago also GHSA-3cf2-x423-x582 , GO-2022-0281 , EUVD-2022-0432

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

A flaw was found in podman. The `podman machine` function (used to create and manage Podman virtual machine containing a Podman process) spawns a `gvproxy` process on the host system. The `gvproxy` API is accessible on port 7777 on all IP addresses on the host. If that port is open on the host's firewall, an attacker can potentially use the `gvproxy` API to forward ports on the host to ports in the VM, making private services on the VM accessible to the network. This issue could be also used to interrupt the host's services by forwarding all ports to the VM.

Patch / fix

  • go github.com/containers/podman/v3 3.4.3
  • podman_project podman 3.4.3
  • libpod Debian 12 3.4.3+ds1-1

debian advisories DEBIAN-CVE-2021-4024

  • crit RHEL 8 3.18-5.module+el8.10.0+22417+2fb00970
  • criu RHEL 8 3.18-5.module+el8.10.0+22417+2fb00970
  • crun RHEL 8 1.14.3-2.module+el8.10.0+22417+2fb00970
  • runc RHEL 8 1:1.1.12-5.module+el8.10.0+22417+2fb00970
  • udica RHEL 8 0.2.6-21.module+el8.10.0+22417+2fb00970
  • conmon RHEL 8 3:2.1.10-1.module+el8.10.0+22417+2fb00970
  • podman RHEL 8 4:4.9.4-18.module+el8.10.0+22417+2fb00970
  • skopeo RHEL 8 2:1.14.5-3.module+el8.10.0+22417+2fb00970

red hat advisories RHSA-2024:10289RHSA-2022:7954

  • podman SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 4.3.1-150300.9.15.1
  • podman SLE Module for Containers 15 SP4, SLE Micro 5.3, openSUSE Leap Micro 5.3 +1 more 4.3.1-150400.4.11.1
  • podman SLE Module for Containers 15 SP3, SLE Micro 5.1 3.4.4-150300.9.3.2
  • conmon SLE Module for Containers 15 SP3, SLE Micro 5.1 2.0.30-150300.8.3.1
  • libseccomp SLE Module for Basesystem 15 SP3, SLE Micro 5.1 2.5.3-150300.10.5.1
  • libcontainers-common SLE Module for Basesystem 15 SP3, SLE Micro 5.1 20210626-150300.8.3.1

suse advisories SUSE-SU-2023:0326-1SUSE-SU-2023:0187-1SUSE-SU-2022:23018-1

  • podman openSUSE Tumbleweed 3.4.4-1.1
  • podman openSUSE Leap 15.3 3.4.4-150300.9.3.2
  • conmon openSUSE Leap 15.3 2.0.30-150300.8.3.1
  • libseccomp openSUSE Leap 15.3 2.5.3-150300.10.5.1
  • libcontainers-common openSUSE Leap 15.3 20210626-150300.8.3.1

opensuse advisories openSUSE-SU-2024:11674-1openSUSE-SU-2022:23018-1

  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3901+4b80ecd7
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3845+87b84552
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3858+6ad51f9f
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3926+f12484f5
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3876+e55593a8
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3909+6e1c1eb7
  • crun AlmaLinux 8 1.14.3-2.module_el8.10.0+3845+87b84552
  • crun AlmaLinux 8 1.14.3-2.module_el8.10.0+3909+6e1c1eb7

almalinux advisories ALSA-2024:10289ALSA-2022:7954

  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1815+5fe7415e
  • crun Rocky Linux 8 1.14.3-2.module+el8.10.0+1815+5fe7415e
  • runc Rocky Linux 8 1:1.1.12-5.module+el8.10.0+1874+ce489889
  • udica Rocky Linux 8 0.2.6-21.module+el8.10.0+1815+5fe7415e
  • conmon Rocky Linux 8 3:2.1.10-1.module+el8.10.0+1815+5fe7415e
  • podman Rocky Linux 8 4:4.9.4-18.module+el8.10.0+1896+b18fa106
  • skopeo Rocky Linux 8 2:1.14.5-3.module+el8.10.0+1843+6892ab28
  • buildah Rocky Linux 8 2:1.33.11-1.module+el8.10.0+1896+b18fa106

rocky linux advisories RLSA-2024:10289

  • podman Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 3.4.4-r0

alpine advisories ALPINE-CVE-2021-4024

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • podman Arch Linux 3.4.4-1

arch linux advisories AVG-2591

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4024 updated cvss 4.8

podman: podman machine spawns gvproxy with port bound to all IPs

  • Red Hat Enterprise Linux AppStream (v. 8) crit 3.18-5.module+el8.10.0+22417+2fb00970, criu 3.18-5.module+el8.10.0+22417+2fb00970, crun 1.14.3-2.module+el8.10.0+22417+2fb00970, runc 1.1.12-5.module+el8.10.0+22417+2fb00970, udica 0.2.6-21.module+el8.10.0+22417+2fb00970, conmon 2.1.10-1.module+el8.10.0+22417+2fb00970, +27 more
    fixed: vendor fix RHSA-2024:10289
  • Red Hat Enterprise Linux AppStream (v. 9) podman 4.2.0-3.el9, podman-tests 4.2.0-3.el9, podman-docker 4.2.0-3.el9, podman-remote 4.2.0-3.el9, podman-gvproxy 4.2.0-3.el9, podman-plugins 4.2.0-3.el9
    fixed: vendor fix RHSA-2022:7954
  • Red Hat Enterprise Linux 7 podman Red Hat Enterprise Linux 8 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more Red Hat OpenShift Container Platform 3.11 podman Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/containers/podman/v3
<3.4.3
3.4.3
go github.com/containers/podman
all versions
 no fix listed
go github.com/containers/podman/v2
all versions
 no fix listed

Affected products

  • n/a podman

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-346 Origin Validation Error

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.