ACK: [SRU][F/J/L][PATCH 0/1] CVE-2023-39193

[Stefan Bader]

On 26.10.23 16:15, Magali Lemes wrote:
> [Impact]
> A flaw was found in the Netfilter subsystem in the Linux kernel. The
> sctp_mt_check did not validate the flag_count field. This flaw allows a local
> privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading
> to a crash or information disclosure.
> 
> [Backport]
> Clean cherry-pick.
> 
> [Test]
> Compile, boot and smoke tested on a VM:
> ```
> (vm) $ sudo iptables -A INPUT -p sctp -m sctp --dport 12345 -j LOG
> (vm) $ ncat --sctp -l -p 12345
> 
> (host) $ echo "testing" | ncat --sctp $VM_IP 12345
> 
> (vm) $ sudo dmesg | tail # here we expect to see some logs
> ```
> 
> [Regression potential]
> Limited to the sctp packet matching module.
> 
> Wander Lairson Costa (1):
>    netfilter: xt_sctp: validate the flag_info count
> 
>   net/netfilter/xt_sctp.c | 2 ++
>   1 file changed, 2 insertions(+)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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