On Thursday 14 Apr 2016 19:43:52 Jonathan Callen wrote: > On 04/14/2016 04:40 PM, Mick wrote: > > I run chkrootkit and rkhunter on my laptop. Suddenly I noticed > > this in my logs: > > > > /dev/shm/pulse-shm-2469735543 Possible Linux/Ebury - Operation > > Windigo installetd > > > > > > Then, rkhunter shows: > > > > [20:23:27] Info: Starting test name 'filesystem' [20:23:27] > > Performing filesystem checks [20:23:27] Info: SCAN_MODE_DEV set to > > 'THOROUGH' [20:23:33] Checking /dev for suspicious file types > > [ Warning ] [20:23:33] Warning: Suspicious file types found in > > /dev: [20:23:33] /dev/shm/pulse-shm-3629268439: data > > [20:23:33] /dev/shm/pulse-shm-2350047684: data [20:23:33] > > /dev/shm/pulse-shm-2469735543: data [20:23:33] > > /dev/shm/pulse-shm-2586322339: data [20:23:33] > > /dev/shm/PostgreSQL.1804289383: data [20:23:34] Checking for > > hidden files and directories [ Warning ] [20:23:34] Warning: > > Hidden file found: /usr/share/man/man5/.k5login.5: troff or > > preprocessor input, ASCII text [20:23:34] Warning: Hidden file > > found: /usr/share/man/man5/.k5identity.5: troff or preprocessor > > input, ASCII text [20:23:34] Checking for missing log files > > [ Skipped ] [20:23:34] Checking for empty log files > > [ Skipped ] > > > > > > I search on the errors and I arrive at this FAQs: > > > > https://www.cert-bund.de/ebury-faq > > > > > > Now, I frequently login using ssh into remote servers and LAN boxen > > for admin purposes, but not the other way around. Is my box > > compromised, or is this two false positives in a row? > > > > Are you getting anything similar on your systems? > > The hidden files in /usr/share/man/man5 are definitely false > positives. These two files are installed by the app-crypt/mit-krb5 > package, and just allow you to type "man .k5login" instead of "man > k5login" to get information about the ".k5login" file that you might > want to create in your home directory (if using kerberos).
OK, this is good to know. I am not using kerberos, but I think it was installed as a dependency somewhere along the line. > The files in /dev/shm/ named "pulse-shm-*" are created by pulseaudio > for its own internal use; applications that may play sounds through > pulseaudio will create those files automatically. > > The PostgreSQL.* file is likely also a false positive, but I do not > have postgres installed here to confirm. I can't think why postgres would be flagged up as a warning. I use it for akonadi instead of mysql, so unless some email ran a sql injection on it via kmail and got access to the database, it should be OK. All these chrootkit and rkhunter warnings are about /dev/shm/ files/devices. Is there something that makes anything in /dev/shm inherently suspicious? -- Regards, Mick
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