CVE-2023-52628 netfilter: nftables: exthdr: fix 4-byte stack OOB write

2024-03-2807:33:46

Linux

github.com

linux kernel

netfilter

nftables

stack oob write

vulnerability

zdi-can-21950

zdi-can-21951

zdi-can-21961

6.7 Medium

AI Score

Confidence

Low

0.0005 Low

EPSS

Percentile

16.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nftables: exthdr: fix 4-byte stack OOB write

If priv->len is a multiple of 4, then dst[len / 4] can write past
the destination array which leads to stack corruption.

This construct is necessary to clean the remainder of the register
in case ->len is NOT a multiple of the register size, so make it
conditional just like nft_payload.c does.

The bug was added in 4.1 cycle and then copied/inherited when
tcp/sctp and ip option support was added.

Bug reported by Zero Day Initiative project (ZDI-CAN-21950,
ZDI-CAN-21951, ZDI-CAN-21961).

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "28a97c43c9e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "a7d86a77c33b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "1ad7b189cc14",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "d9ebfc0f2137",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "c8f292322ff1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "49499c3e6e18",
        "lessThan": "fd94d9dadee5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_exthdr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.1",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.19.316",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.198",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.132",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.54",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.5.4",
        "versionType": "custom",
        "lessThanOrEqual": "6.5.*"
      },
      {
        "status": "unaffected",
        "version": "6.6",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nft_exthdr.c"
    ],
    "defaultStatus": "affected"
  }
]