In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_multiport: validate range encoding in checkentry ports_match_v1() treats any non-zero pflags entry as the start of a port range and unconditionally consumes the next ports[] element as the range end. The checkentry path currently validates protocol, flags and count, but it does not validate the range encoding itself. As a result, malformed rules can mark the last slot as a range start or place two range starts back to back, leaving ports_match_v1() to step past the last valid ports[] element while interpreting the rule. Reject malformed multiport v1 rules in checkentry by validating that each range start has a following element and that the following element is not itself marked as another range start.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
NVD-CWE-noinfo
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| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d239fbdd800> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23beb16480> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2357cce000> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d239fbdf880> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbde1c0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbdc380> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23beb16100> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbded80> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbdcb80> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbdc500> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23a532d5c0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* |