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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

Tweets

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    1. Mesh3L‏ @0x_saudi 29 Oct 2018
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      Replying to @iagox86 @GossiTheDog and

      first time i heard "authenticated RCE", nice finding, nice term 😊

      1 reply 0 retweets 0 likes
    2. Ron Bowes‏ @iagox86 29 Oct 2018
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      Replying to @0x_saudi @GossiTheDog and

      I used to write plugins for a vulnerability scanner for my job. Authenticated RCE or post-auth RCE was a common enough term. Just a vuln in an app after logging in.

      1 reply 0 retweets 0 likes
    3. Mesh3L‏ @0x_saudi 29 Oct 2018
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      Replying to @iagox86 @GossiTheDog and

      it seems we are fighting on terms, other than that its a great exploit ;)

      1 reply 0 retweets 0 likes
    4. Ron Bowes‏ @iagox86 29 Oct 2018
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      Replying to @0x_saudi @GossiTheDog and

      Indeed! I was chatting with @edskoudis this morning, and we likened it to calling a client-side exploit an RCE. There's an extra step - a user clicking on it - but client-side vulns are still considered RCE by most. I might write a blog/essay on this style of post-auth vuln. :)

      1 reply 0 retweets 0 likes
    5. Tavis Ormandy‏Verified account @taviso 29 Oct 2018
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      Replying to @iagox86 @0x_saudi and

      It's not really the same, a post-auth RCE in RDP or SSH is not a bug. A post-auth RCE in IMAP is a bug, it's not expected that an email account allows code execution. You can configure forcecommand=Xorg, but that's not a post-auth RCE in Xorg, right? It's an LPE.

      1 reply 1 retweet 3 likes
    6. Tavis Ormandy‏Verified account @taviso 29 Oct 2018
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      Replying to @taviso @iagox86 and

      I think you think we're all new to this concept of post-auth vs pre-auth RCE, but that's not it! 😋

      1 reply 0 retweets 0 likes
    7. Ron Bowes‏ @iagox86 29 Oct 2018
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      Replying to @taviso @0x_saudi and

      I don't see this as different from any post-auth bug. The svcctl interface is just that - an interface. This is a programming bug in a program that happens to be available via svcctl, for omitting proper parameter checks. Not really admin functionality at all!

      1 reply 0 retweets 0 likes
    8. Tavis Ormandy‏Verified account @taviso 30 Oct 2018
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      Replying to @iagox86 @0x_saudi and

      Yes, but you're imagining a configuration that gives svcctl access but not code execution. That's possible, but so is forcecommand=Xorg, at some point you need to say "requires local access" , or what even is an LPE?

      1 reply 0 retweets 1 like
    9. Jeff McJunkin‏ @jeffmcjunkin 30 Oct 2018
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      Replying to @taviso @iagox86 and

      For this vuln, WebEx really is configured to allow all local or domain users permissions to start the service, which is of course highly unusual. Normally that wouldn't be RCE, except for the service arguments @iagox86 found the CMDi in.

      2 replies 0 retweets 0 likes
    10. Jeff McJunkin‏ @jeffmcjunkin 30 Oct 2018
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      Replying to @jeffmcjunkin @taviso and

      Nearly all services have perms for admins only (local or remote). The non-standard permissions along with the CMDi is what gives code execution. Same as adding Domain Users to local Administrators group for Win <10

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 30 Oct 2018
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      Replying to @jeffmcjunkin @iagox86 and

      You don't need to explain windows to me, I've patched EPROCESS enough that I can memorize the offsets 😋

      12:22 AM - 30 Oct 2018
      1 reply 0 retweets 0 likes
        1. Jeff McJunkin‏ @jeffmcjunkin 30 Oct 2018
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          Replying to @taviso @iagox86 and

          Oh, I have full respect for your Windows-fu! 😁 I'm trying to keep the fanboy-ism to a minimum.

          0 replies 0 retweets 0 likes
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