Description
extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets. NOTE: the CVE-2012-6638 fix makes this issue less relevant.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | iptables | No fix yet | — |
| Debian 13 | iptables | No fix yet | — |
| Debian 12 | iptables | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | iptables | No fix yet | — |
| Ubuntu 18.04 LTS | iptables | No fix yet | — |
| Ubuntu 16.04 LTS | iptables | No fix yet | — |
| Ubuntu 14.04 LTS | iptables | No fix yet | — |