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CVE Request: Linux: NULL pointer dereference netfilter/nf_nat_redirect.c in nf_nat_redirect_ipv4 function
From: Salvatore Bonaccorso <carnil () debian org>
Date: Wed, 27 Jan 2016 16:40:41 +0100
Hi
From https://bugzilla.redhat.com/show_bug.cgi?id=1300731 Kernel NULL pointer dereference vulnerability was found in netfilter/nf_nat_redirect.c in nf_nat_redirect_ipv4 function introduced by commit 8b13eddfdf04cbfa561725cfc42d6868fe896f56 ("netfilter: refactor NAT redirect IPv4 to use it from nf_tables"). Vulnerable code: unsigned int nf_nat_redirect_ipv4(struct sk_buff *skb, ... { ... rcu_read_lock(); indev = __in_dev_get_rcu(skb->dev); if (indev != NULL) { ifa = indev->ifa_list; newdst = ifa->ifa_local; <--- } rcu_read_unlock(); ... } 'ifa' is not checked before access and can be accessed even if it's NULL. Crash might happen when packets that need to be redirected somehow arrive on an interface which hasn't been yet fully configured. Patch and crash report: https://lkml.org/lkml/2015/12/2/618
This was introduced in: https://git.kernel.org/linus/8b13eddfdf04cbfa561725cfc42d6868fe896f56 (v3.19-rc1) Fixed by: https://git.kernel.org/linus/94f9cd81436c85d8c3a318ba92e236ede73752fc (v4.4-rc1) Can you assign a CVE to track this issue? Regards, Salvatore
Current thread:
- CVE Request: Linux: NULL pointer dereference netfilter/nf_nat_redirect.c in nf_nat_redirect_ipv4 function Salvatore Bonaccorso (Jan 27)