In the Linux kernel, the following vulnerability has been resolved: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() Sashiko AI-review observed: In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet where its cb contains an IPv4 inet_skb_parm. When skb is cloned into skb2 and passed to icmp6_send(), it uses IP6CB(skb2). IP6CB interprets the IPv4 inet_skb_parm as an inet6_skb_parm. The cipso offset in inet_skb_parm.opt directly overlaps with dsthao in inet6_skb_parm at offset 18. If an attacker sends a forged ICMPv4 error with a CIPSO IP option, dsthao would be a non-zero offset. Inside icmp6_send(), mip6_addr_swap() is called and uses ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO). This would scan the inner, attacker-controlled IPv6 packet starting at that offset, potentially returning a fake TLV without checking if the remaining packet length can hold the full 18-byte struct ipv6_destopt_hao. Could mip6_addr_swap() then perform a 16-byte swap that extends past the end of the packet data into skb_shared_info? Should the cb array also be cleared in ip6_err_gen_icmpv6_unreach() and ip6ip6_err() to prevent this? This patch implements the first suggestion. I am not sure if ip6ip6_err() needs to be changed. A separate patch would be better anyway.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | NETWORK |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | NONE |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Type: Secondary
Exploitability Score: 3.9
Impact Score: 5.9
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
NVD-CWE-noinfo
|
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary |
en
CWE-843
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde534180> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde536440> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde534280> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde534600> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde537b40> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde536cc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde534840> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bde5362c0> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bdc9f6480> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bde535a80> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bde5358c0> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bdc9f4600> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702bdd1294c0> | Operating System |
| linux | linux_kernel | 3.13 | <built-in method update of dict object at 0x702b83f2e980> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702bdc4fec00> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702bde537340> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702bde537c80> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702b83f2d300> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702bde534d00> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x702bdd129240> | 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:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:-:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc6:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc7:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:3.13:rc8:*:*:*:*:*:* |
| 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:*:*:*:*:*:* |