* Bump ip-masq-agent to v2.1.1 ([#67916](https://github.com/kubernetes/kubernetes/pull/67916), [@MrHohn](https://github.com/MrHohn))
    * Update debian-iptables image for CVEs.
    * Change chain name to IP-MASQ to be compatible with the pre-injected masquerade rules.

**CVSS Rating:** High (8.8) [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)


### CVE-2023-3676: Insufficient input sanitization on Windows nodes leads to privilege escalation

  - kube-apiserver v1.19.10
  - kube-apiserver v1.18.18

This vulnerability was reported by Rogerio Bastos & Ari Lima from RedHat


**CVSS Rating:** Medium (6.5) [CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H)

## Changes by Kind

### API Change

### Other (Cleanup or Flake)
 - base-images: Use debian-base:v2.1.0 (includes CVE fixes)
  - base-images: Use debian-iptables:v12.1.0 (includes CVE fixes) ([#90938](https://github.com/kubernetes/kubernetes/pull/90938), [@justaugustus](https://github.com/justaugustus)) [SIG API Machinery, Cluster Lifecycle and Release]

## Dependencies

* Update cluster-proportional-autoscaler, metadata-proxy, and fluentd-gcp addons with fixes for CVE-2016-4448, CVE-2016-8859, CVE-2016-9841, CVE-2016-9843, and CVE-2017-9526. ([#47545](https://github.com/kubernetes/kubernetes/pull/47545), [@ixdy](https://github.com/ixdy))

**CVSS Rating:** High (8.8) [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)


### CVE-2023-3676: Insufficient input sanitization on Windows nodes leads to privilege escalation

**Fixed Versions**:
  - kube-apiserver v1.29.4
  - kube-apiserver v1.28.9
  - kube-apiserver v1.27.13

This vulnerability was reported by tha3e1vl.


**CVSS Rating:** Low (2.7) [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N)

## Changes by Kind

### Feature

- Kubernetes is now built with go 1.21.9

  * Update kube-dns, metadata-proxy, and fluentd-gcp, event-exporter, prometheus-to-sd, and ip-masq-agent addons with new base images containing fixes for CVE-2016-4448, CVE-2016-9841, CVE-2016-9843, CVE-2017-1000366, CVE-2017-2616, and CVE-2017-9526. ([#47877](https://github.com/kubernetes/kubernetes/pull/47877), [@ixdy](https://github.com/ixdy))

## Changelog since v1.14.4

* Fix CVE-2019-11249: Incomplete fixes for CVE-2019-1002101 and CVE-2019-11246, kubectl cp potential directory traversal ([#80436](https://github.com/kubernetes/kubernetes/pull/80436))
* Fix CVE-2019-11247: API server allows access to custom resources via wrong scope ([#80750](https://github.com/kubernetes/kubernetes/pull/80750))

### Other notable changes

* gci: decouple from the built-in kubelet version ([#31367](https://github.com/kubernetes/kubernetes/pull/31367), [@Amey-D](https://github.com/Amey-D))
* Bump GCE debian image to container-vm-v20161025 (CVE-2016-5195 Dirty… ([#35825](https://github.com/kubernetes/kubernetes/pull/35825), [@dchen1107](https://github.com/dchen1107))