How to recover a SQL Server login password.

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Home » Article Discussions » Article Discussions by Author » Discuss content posted by Geoff Albin » How to recover a SQL Server login password.

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How to recover a SQL Server login password.

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BenWard

Posted Wednesday, March 06, 2013 4:19 AM

Old Hand

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Last Login: Wednesday, May 08, 2013 7:23 AM
Points: 324, Visits: 531

Michael Meierruth (3/6/2013)

paul.knibbs (3/6/2013)

SQLCharger (3/6/2013)

Guys,

Would this also work with Windows hashes as well?
That would be even more scary (if someone manages to get your Windows hash from a server). Unsure

There's no reason why it wouldn't, but getting the Windows hash of your password from the server isn't a trivial thing--you usually need admin access in order to read the SAM database, and if you already have that level of access, why do you care about hacking somebody else's password?

It's for finding those people who use the same password everywhere else...

And naughty people who want to steal/sell sensitive data, but do it with someone else's name in the audit log so some poor innocent bloke gets fired instead of the real criminal.

Ben

^ Thats me!

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01010111011010000110000101110100 01100001 0110001101101111011011010111000001101100011001010111010001100101 01110100011010010110110101100101 011101110110000101110011011101000110010101110010
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Post #1427296

Michael Meierruth

Posted Wednesday, March 06, 2013 5:04 AM

SSC-Addicted

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Last Login: Sunday, May 05, 2013 10:12 AM
Points: 480, Visits: 1,604

And what's the point of what you're saying in your binary signature?

Post #1427319

SQLCharger

Posted Wednesday, March 06, 2013 6:54 AM

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Michael Meierruth (3/6/2013)

And what's the point of what you're saying in your binary signature?

A yes/no answer will suffice Tongue

Cheers,

JohnA

Post #1427360

BenWard

Posted Wednesday, March 06, 2013 6:59 AM

Old Hand

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Last Login: Wednesday, May 08, 2013 7:23 AM
Points: 324, Visits: 531

Michael Meierruth (3/6/2013)

And what's the point of what you're saying in your binary signature?

It's self-referential.

Ben

^ Thats me!

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01010111011010000110000101110100 01100001 0110001101101111011011010111000001101100011001010111010001100101 01110100011010010110110101100101 011101110110000101110011011101000110010101110010
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Post #1427364

K. Brian Kelley

Posted Wednesday, March 06, 2013 7:32 AM

Keeper of the Duck

Group: Moderators
Last Login: Yesterday @ 4:47 PM
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Michael Meierruth (3/6/2013)

paul.knibbs (3/6/2013)

SQLCharger (3/6/2013)

Guys,

Would this also work with Windows hashes as well?
That would be even more scary (if someone manages to get your Windows hash from a server). Unsure

It's for finding those people who use the same password everywhere else...

Or for escalating privileges, especially in a domain. Standard attack pattern:

1. Gain admin rights to a workstation or server.
2. Dump LSA Secrets. This gives you the password in plaintext for any services.
3. See what rights/group memberships those accounts have. They are now in your set of accounts to use for further compromise.
4. Dump the hashes from that system.
5. Use rainbow tables to gain the password from said hashes.
6. See what rights/group memberships those accounts have. They are also now in your set of accounts to use for further compromise.
7. If you've got a Domain Admin level at this point, you're set. You own the domain (and technically, the forest, meaning also every domain in said forest).
8. If you don't have an account with the level of privs that you want, spiderweb to other systems, trying the accounts you've captured and repeating steps 1-7.

3.

K. Brian Kelley, CISA, MCSE, Security+, MVP - SQL Server
Regular Columnist (Security), SQLServerCentral.com
Author of Introduction to SQL Server: Basic Skills for Any SQL Server User
| Professional Development blog | Technical Blog |

LinkedIn | Twitter

Post #1427396

Nadrek

Posted Wednesday, March 06, 2013 8:06 AM

Say Hey Kid

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paul.knibbs (3/6/2013)

SQLCharger (3/6/2013)

Guys,

Would this also work with Windows hashes as well?
That would be even more scary (if someone manages to get your Windows hash from a server). Unsure

There's no reason why it wouldn't, but getting the Windows hash of your password from the server isn't a trivial thing--you usually need admin access in order to read the SAM database...

And this is why SQL Server Service accounts should be minimally privileged (i.e. NEVER ADMIN, either local or domain) - so someone breaking one sysadmin-level account on the SQL Server instance has a harder time getting into other machines.

Yes, oclHashcat-lite and/or oclHashcat-plus have settings for various forms of Windows and Active Directory passwords (as well as Oracle, Mac, Cisco, and other modes).

Post #1427435

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