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Bug 1614973 - (CVE-2018-10933) CVE-2018-10933 libssh: Authentication Bypass due to improper message callbacks implementation
CVE-2018-10933 libssh: Authentication Bypass due to improper message callback...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20181016:1200...
: Security
Depends On: 1637257 1637258 1639926 1639925
Blocks: 1614980
  Show dependency treegraph
 
Reported: 2018-08-10 17:51 EDT by Laura Pardo
Modified: 2018-11-12 03:31 EST (History)
20 users (show)

See Also:
Fixed In Version: libssh 0.7.6, libssh 0.8.4
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in libssh's server-side state machine. A malicious client could create channels without first performing authentication, resulting in unauthorized access.
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 3661121 None None None 2018-10-21 23:18 EDT

  None (edit)
Description Laura Pardo 2018-08-10 17:51:40 EDT
A flaw was found in libSSH which can enable a client to bypass the authentication process and set the internal state machine maintained by the library to authenticated, enabling the (otherwise prohibited) creation of channels.
Comment 1 Doran Moppert 2018-10-08 22:21:16 EDT
Acknowledgments:

Name: the libssh team
Upstream: Peter Winter-Smith (NCC Group)
Comment 5 Doran Moppert 2018-10-16 18:56:25 EDT
Created libssh tracking bugs for this issue:

Affects: fedora-all [bug 1639925]
Comment 7 Doran Moppert 2018-10-16 18:57:22 EDT
Upstream issue:

https://bugs.libssh.org/T101
Comment 8 Doran Moppert 2018-10-16 18:57:33 EDT
External References:

https://www.libssh.org/security/advisories/CVE-2018-10933.txt
Comment 17 Doran Moppert 2018-10-18 19:24:56 EDT
Statement:

This vulnerability affects libssh shipped in Red Hat Enterprise Linux 7 Extras. No libssh packages are included in Red Hat Enterprise Linux 6 and earlier. This issue does not affect libssh2 or openssh.

This issue can only be affect applications that use libssh to implement an SSH server; SSH client functionality is not affected. No packages in Red Hat products use libssh to implement an SSH server. Therefore, no package from Red Hat that uses the libssh library is affected by this flaw.

The libssh library is available for customer or third party code to use. Such code that is linked against libssh and uses the `ssh_bind*` functions may be affected by this flaw.

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