<div dir="ltr"><div>Hi All, </div><div>Please ask me one question regarding about of RHEL security. To hack RHEL root privilege is possible or not ? Even this system didn't try to patch update CVE,RHSA and so on. </div><div>Thanks in advance for your feedback. </div><div>All the best, </div><div>-Aung </div><div> </div><div class="gmail_extra"> <div class="gmail_quote">On Thu, Jul 14, 2016 at 10:30 PM, <<a href="mailto:linux-audit-request@redhat.com" target="_blank">linux-audit-request@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Linux-audit mailing list submissions to <a href="mailto:linux-audit@redhat.com">linux-audit@redhat.com</a> To subscribe or unsubscribe via the World Wide Web, visit <a href="https://www.redhat.com/mailman/listinfo/linux-audit" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/linux-audit</a> or, via email, send a message with subject or body 'help' to <a href="mailto:linux-audit-request@redhat.com">linux-audit-request@redhat.com</a> You can reach the person managing the list at <a href="mailto:linux-audit-owner@redhat.com">linux-audit-owner@redhat.com</a> When replying, please edit your Subject line so it is more specific than "Re: Contents of Linux-audit digest..." Today's Topics: 1. Re: Weird issues in 2.6.5 (Chris Nandor) 2. [PATCH] Fix whitespace in CWD record (Steve Grubb) ---------------------------------------------------------------------- Message: 1 Date: Wed, 13 Jul 2016 15:22:01 -0700 From: Chris Nandor <<a href="mailto:pudge@pobox.com">pudge@pobox.com</a>> To: Steve Grubb <<a href="mailto:sgrubb@redhat.com">sgrubb@redhat.com</a>> Cc: <a href="mailto:linux-audit@redhat.com">linux-audit@redhat.com</a> Subject: Re: Weird issues in 2.6.5 Message-ID: <CAHcE2wrPftjsy2QMB4+qsa9o-S=<a href="mailto:xWqjiD%2BrtKX0wM24ksT0tkQ@mail.gmail.com">xWqjiD+rtKX0wM24ksT0tkQ@mail.gmail.com</a>> Content-Type: text/plain; charset="utf-8" I set heartbeat to 60 on the client and idle to 120 on the server. Reconnects seem fine now, although I never did nail down the exact conditions under which reconnects failed. But I still have the problem of weird buffering on the client side. If I run `sudo ls` on the client side, locally I get something like: node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=SYSCALL msg=audit(1468448156.161:3288765): arch=c000003e syscall=59 success=yes exit=0 a0=8f81e8 a1=8f7578 a2=8febf0 a3=7ffd3d956370 items=2 ppid=19387 pid=19388 auid=2288 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts4 ses=399 comm="ls" exe="/bin/ls" key="rootcmd" node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=EXECVE msg=audit(1468448156.161:3288765): argc=1 a0="ls" node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=CWD msg=audit(1468448156.161:3288765): cwd="/tmp" node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=PATH msg=audit(1468448156.161:3288765): item=0 name="/bin/ls" inode=132438 dev=09:01 mode=0100755 ouid=0 ogid=0 rdev=00:00 node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=PATH msg=audit(1468448156.161:3288765): item=1 name=(null) inode=71179 dev=09:01 mode=0100755 ouid=0 ogid=0 rdev=00:00 But remotely, I just get: node=<a href="http://grax.sea.marchex.com" rel="noreferrer" target="_blank">grax.sea.marchex.com</a> type=SYSCALL msg=audit(1468448156.161:3288765): arch=c000003e syscall=59 success=yes exit=0 a0=8f81e8 a1=8f7578 a2=8febf0 a3=7ffd3d956370 items=2 ppid=19387 pid=19388 auid=2288 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts4 ses=399 comm="ls" exe="/bin/ls" key="rootcmd" Just the first line of the audit record. No matter how long I wait. If I then run `sudo ls` again, *then* the rest of the lines show up in the server's log. The buffering appears to be on the client side, because if I restart the server's auditd, those lines are not lost: they still appear in the remote log ... but not until the next time I run `sudo ls` on the client side. This is on 1.7.x. This does not happen on 2.4.x or 2.6.x. On Wed, Jul 13, 2016 at 11:38 AM, Steve Grubb <<a href="mailto:sgrubb@redhat.com">sgrubb@redhat.com</a>> wrote: > On Wednesday, July 13, 2016 10:51:07 AM EDT Chris Nandor wrote: > > The only reason I am even upgrading is because of the issues with > > audisp-remote, the not-reconnecting, and the apparent client-side > > buffering, that went away with 2.4.x and 2.6.x. So if we decide to ship > > logs a different way than with audisp-remote, then it might be best to > > stick with 1.7.x. > > This sounds a lot like the idle detection is not set right. In audisp- > remote.conf there is a setting heartbeat_timeout. This should be set to > something like 60 or 120. Then on the server in auditd.conf there is a > setting > tcp_client_max_idle which should be over twice as high as > heartbeat_timeout. > So, you'd set it to 180 or 300. > > > That said, so far I see no issues, so we're going to forge ahead and see > > what happens. I just need to keep in mind what our mitigation plan would > > be if we do run into issues. > > Old utilities won't know what to do with enriched events. AFAICS, that > would > be the long term issue. You'll need to do aperl, awk, or cut command to > trim > off the unknown part of the event in your logs. > > -Steve > -------------- next part -------------- An HTML attachment was scrubbed... URL: <<a href="https://www.redhat.com/archives/linux-audit/attachments/20160713/023e5d70/attachment.html" rel="noreferrer" target="_blank">https://www.redhat.com/archives/linux-audit/attachments/20160713/023e5d70/attachment.html</a>> ------------------------------ Message: 2 Date: Thu, 14 Jul 2016 10:59:19 -0400 From: Steve Grubb <<a href="mailto:sgrubb@redhat.com">sgrubb@redhat.com</a>> To: <a href="mailto:linux-audit@redhat.com">linux-audit@redhat.com</a> Subject: [PATCH] Fix whitespace in CWD record Message-ID: <1772571.A9vuBSQyZx@x2> Content-Type: text/plain; charset="us-ascii" Fix the whitespace in the CWD record Signed-off-by: Steve Grubb <<a href="mailto:sgrubb@redhat.com">sgrubb@redhat.com</a>> --- kernel/auditsc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -urp linux-4.7.0-0.rc4.git1.1.fc23.x86_64.orig/kernel/auditsc.c linux-4.7.0-0.rc4.git1.1.fc23.x86_64/kernel/auditsc.c --- linux-4.7.0-0.rc4.git1.1.fc23.x86_64.orig/kernel/auditsc.c 2016-06-25 12:44:41.756440052 -0400 +++ linux-4.7.0-0.rc4.git1.1.fc23.x86_64/kernel/auditsc.c 2016-07-14 09:56:50.222227280 -0400 @@ -1426,7 +1426,7 @@ static void audit_log_exit(struct audit_ if (context->pwd.dentry && context->pwd.mnt) { ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); if (ab) { - audit_log_d_path(ab, " cwd=", &context->pwd); + audit_log_d_path(ab, "cwd=", &context->pwd); audit_log_end(ab); } } ------------------------------ -- Linux-audit mailing list <a href="mailto:Linux-audit@redhat.com">Linux-audit@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-audit" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/linux-audit</a> End of Linux-audit Digest, Vol 142, Issue 18 ******************************************** </blockquote></div> </div></div>