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Thread: Update Manager sudo trojan

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  1. #1
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    Update Manager sudo trojan

    sudo TWICE in Update Manager?

    Last night ~00:00UTC 2012-05-17 I had one item on Update Manager.

    I clicked 'Check' just in case there were others. There were. I then absent mindedly clicked 'Install Updates' without checking the list first.

    When it had finished, I noticed in the by now greyed-out list, two entries for sudo. One had a checkbox, as normal, but one had no checkbox -- ie no option not to choose it. They were:

    Code:
       checkbox  sudo  allow elevation to superuser by user
    no checkbox  sudo  allow elevation to superuser by specranch
    I can't remember the usual descriptive wording, but the specranch bit is as it was.

    Have I somehow allowed in a trojan? Or in some other way been cracked?

    Is it ever the case for an item in update to be un-tickable?

    Apart from sources and signing keys for Ubuntu Lucid,
    my other sources (with signing keys) are:
    Code:
    Ubuntu Lucid partner
    Virtualbox (Oracle)
    Scribus (debian archive)
    Can anyone put my mind at rest?
    Thanks
    Alan
    Last edited by AlanQ; May 17th, 2012 at 04:02 PM. Reason: improved first line

  2. #2
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    Re: Update Manager sudo trojan

    I arrived on this site doing a search also concerned about an update that referred to SUDO. Just got my normal periodic update Ubuntu thingy and updated it without thinking twice, noticed the update referred to SUDO then thought "wonder if I've just compromised my system, better check it out."

  3. #3
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    Re: Update Manager sudo trojan

    From what I can see this (on Mint mind you not Ubuntu) there is a fix to sudo

    http://packetstormsecurity.org/files...USN-1442-1.txt

  4. #4
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    Re: Update Manager sudo trojan

    Thank you, Delfairen

    Your link contains a link to a link to here
    Ubuntu Security Notice USN-1442-1

    That would explain a sudo update last night.

    And it's a step towards a positive resolution to this conundrum.

    Still doesn't explain why I had TWO entries in the update list for sudo, and the second strange one was un-tickable. Just one, with a tick-box, and I wouldn't be worried.

    Maybe the second one was for sudo-ldap ...?

    Has anyone else ever noticed an entry in Update Manager with no tick-box, ie no option to un-select it?

  5. #5
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    Re: Update Manager sudo trojan

    Found my dpkg.log file, assume what's below to be normal and the update referred to by poster above?

    2012-05-17 14:43:14 startup archives unpack
    2012-05-17 14:43:22 upgrade sudo 1.7.2p1-1ubuntu5.3 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:22 status half-configured sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 14:43:22 status unpacked sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 14:43:22 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 14:43:22 status triggers-pending man-db 2.5.7-2ubuntu1
    2012-05-17 14:43:22 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 14:43:24 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 14:43:24 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:24 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:25 trigproc man-db 2.5.7-2ubuntu1 2.5.7-2ubuntu1
    2012-05-17 14:43:25 status half-configured man-db 2.5.7-2ubuntu1
    2012-05-17 14:43:29 status installed man-db 2.5.7-2ubuntu1
    2012-05-17 14:43:30 startup packages configure
    2012-05-17 14:43:30 configure sudo 1.7.2p1-1ubuntu5.4 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:30 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:30 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:30 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:30 status half-configured sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 14:43:31 status installed sudo 1.7.2p1-1ubuntu5.4

  6. #6
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    Ubuntu 12.04 Precise Pangolin

    Re: Update Manager sudo trojan

    I'm only seeing one entry for sudo in Update Manager and running a simulated apt-get upgrade only seems to pull down one package.

    Code:
    crypto@ubulaptop1204:~$ sudo apt-get -s upgrade
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    The following packages will be upgraded:
      sudo
    1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
    Inst sudo [1.8.3p1-1ubuntu3.1] (1.8.3p1-1ubuntu3.2 Ubuntu:12.04/precise-updates [amd64])
    Conf sudo (1.8.3p1-1ubuntu3.2 Ubuntu:12.04/precise-updates [amd64])
    crypto@ubulaptop1204:~$

    I'm holding off updating it for now as the changelog is not yet available:
    Code:
    crypto@ubulaptop1204:/var/log/apt$ sudo apt-get changelog sudo
    Err Changelog for sudo (http://changelogs.ubuntu.com/changelogs/pool/main/s/sudo/sudo_1.8.3p1-1ubuntu3.2/changelog)
      404  Not Found
    Err Changelog for sudo (http://gb.archive.ubuntu.com/ubuntu/pool/main/s/sudo/sudo_1.8.3p1-1ubuntu3.2.changelog)
      404  Not Found [IP: 91.189.92.176 80]
    E: changelog for this version is not (yet) available; try https://launchpad.net/ubuntu/+source/sudo/+changelog

  7. #7
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    Re: Update Manager sudo trojan

    My dpkg.log for sudo last night is:

    Code:
    alan@cube:/var/log$ cat dpkg.log | grep sudo
    2012-05-17 01:52:20 upgrade sudo 1.7.2p1-1ubuntu5.3 1.7.2p1-1ubuntu5.4
    2012-05-17 01:52:20 status half-configured sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 01:52:21 status unpacked sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 01:52:21 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 01:52:21 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 01:52:21 status half-installed sudo 1.7.2p1-1ubuntu5.3
    2012-05-17 01:52:21 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:52:21 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 configure sudo 1.7.2p1-1ubuntu5.4 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 status unpacked sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 status half-configured sudo 1.7.2p1-1ubuntu5.4
    2012-05-17 01:53:14 status installed sudo 1.7.2p1-1ubuntu5.4
    alan@cube:/var/log$
    Interestingly, as for 3spartan, there are two sudo:
    1.7.2p1-1ubuntu5.3
    and
    1.7.2p1-1ubuntu5.4

    Two updates because 4 followed hot on the heels of 3 and updates must be contiguous?

    This would explain version 3 having no check box, as it's essential before version 4.

    dpkg.log timestamp is correct.

    Of course, if well crafted, a trojan would cover its tracks and delete entries for logs and change timestamps, etc. And I still haven't got to the bottom of specranch. But I'm feeling a bit better. Thanks to all for replies.
    Last edited by AlanQ; May 17th, 2012 at 07:48 PM.

  8. #8
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    Re: Update Manager sudo trojan

    Quote Originally Posted by AlanQ View Post
    Thank you, Delfairen

    Your link contains a link to a link to here
    Ubuntu Security Notice USN-1442-1

    That would explain a sudo update last night.

    And it's a step towards a positive resolution to this conundrum.

    Still doesn't explain why I had TWO entries in the update list for sudo, and the second strange one was un-tickable. Just one, with a tick-box, and I wouldn't be worried.

    Maybe the second one was for sudo-ldap ...?

    Has anyone else ever noticed an entry in Update Manager with no tick-box, ie no option to un-select it?
    A untickable in the update manager can mean two things basically, one it is a partial upgrade, which basically should not be run, as it may mean that the repo does not have all the dependencies, they don't all come from the same teams. Or that you just need to run the manager again as a update, to clear out any now available. With a partitial, generally it will get the dependecies so a wait is advised.

    The standard ubuntu repositories are very safe, I understand your concern here, but it is from a windows stand point. There are no known trojans on the web for a linux setup. You are fine in what you saw in the update manager, but it never hurts to want to understand.

    It really also is partially a definition of what a trojan is and rootkits as well and malware, so check out this area of the forums for more information. These definitions are a bit different in how these play out in a windows system compared to linux, or bsd, or apple setup, apple is basically bsd as well.

    http://ubuntuforums.org/forumdisplay.php?f=338

    Some of your best protection is strong passwords, and being extremely careful with any third party repos or downloads. Really the same as a widows set up as far as an informed user.
    Last edited by wilee-nilee; May 17th, 2012 at 08:08 PM.

  9. #9
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    Re: Update Manager sudo trojan

    Thank you, wilee-nilee

    A untickable in the update manager can mean two things basically, one it is a partial upgrade, which basically should not be run, as it may mean that the repo does not have all the dependencies, they don't all come from the same teams. Or that you just need to run the manager again as a update, to clear out any now available. With a partitial, generally it will get the dependecies so a wait is advised.
    But what about the duplication? Why did I have two sudo with slightly different descriptions?

    The standard ubuntu repositories are very safe, I understand your concern here, but it is from a windows stand point. There are no known trojans on the web for a linux setup.
    So what would happen if the Ubuntu repositories were cracked and a trojan added for download?

    It really also is partially a definition of what a trojan is and rootkits as well and malware, so check out this area of the forums for more information. These definitions are a bit different in how these play out in a windows system compared to linux, or bsd, or apple setup, apple is basically bsd as well.
    As I understand it, a trojan is malicious code that the user puts on his/her computer knowing that it's software, thinking that it's wanted/needed, but not knowing that it's harmful.

    Some of your best protection is strong passwords, and being extremely careful with any third party repos or downloads. Really the same as a widows set up as far as an informed user.
    Third party repos are a concern. But I'm hoping Oracle and Scribus are at least the same order of magnitude as safe as Ubuntu...

  10. #10
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    Re: Update Manager sudo trojan

    Quote Originally Posted by AlanQ View Post
    Have I somehow allowed in a trojan? Or in some other way been cracked?
    No. It would be nearly impossible for that to happen since Ubuntu packages are digitally signed.
    Occam's Razor for computers: Viruses must never be postulated without necessity -- nevius

    My Blog

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