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2024 Jun 27
1
An Analysis of the DHEat DoS Against SSH in Cloud Environments
...400,000 lines
were messages produced by the new PerSourcePenalties logging in
sshd.c:627).
Next, I modified the logging in sshd.c:627 to always use
SYSLOG_LEVEL_DEBUG1 instead of SYSLOG_LEVEL_INFO. Re-running the above
test resulted in 73% average idle time and 8KB of log growth.
Lastly, from an m7i.2xlarge source EC2 instance in AWS, I targeted an
m7i.large instance using "ssh-audit --dheat=4:diffie-hellman-group18-
sha512:4 target_host". In my original research article, this caused
the average idle time to drop to 0.01%; against openssh-SNAP-
20240628.tar.gz with the log level in...
2024 Jun 25
3
An Analysis of the DHEat DoS Against SSH in Cloud Environments
On Wed, 2024-06-19 at 16:11 -0400, Joseph S. Testa II wrote:
> I suppose in the next few days, I'll try reproducing my original
> steps
> with the new version and see what happens.
I managed to do some limited testing with a local VM, and the results
are... interesting.
I installed openssh-SNAP-20240626.tar.gz on a fresh and fully-updated
Ubuntu Linux 24.04 LTS VM with 1 vCPU.
2007 Oct 01
1
mISDN NPI setting with b410p
...erisk News - html)
http://feeds.venturevoip.com/AsteriskNews (Daily Asterisk News - rss)
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