Bug 1687310 (CVE-2019-3860) - CVE-2019-3860 libssh2: Out-of-bounds reads with specially crafted SFTP packets
Summary: CVE-2019-3860 libssh2: Out-of-bounds reads with specially crafted SFTP packets
Keywords:
Status: NEW
Alias: CVE-2019-3860
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20190313,repor...
Depends On: 1690247 1690248 1688443 1688444 1688445 1690408 1696058 1697700
Blocks: 1687317
TreeView+ depends on / blocked
 
Reported: 2019-03-11 08:58 UTC by Andrej Nemec
Modified: 2019-06-08 23:54 UTC (History)
17 users (show)

Fixed In Version: libssh2 1.8.1
Doc Type: If docs needed, set a value
Doc Text:
An out of bounds read flaw was discovered in libssh2 in the way SFTP packets with empty payloads are parsed. A remote attacker who compromises a SSH server may be able to cause a denial of service or read data in the client memory.
Clone Of:
Environment:
Last Closed:


Attachments (Terms of Use)

Description Andrej Nemec 2019-03-11 08:58:36 UTC
A server could send a specially crafted partial SFTP packet with a empty payload
in response to various SFTP commands such as read directory, file status,
status vfs and symlink. The result would be a memory out of bounds read.

Comment 2 Andrej Nemec 2019-03-12 09:15:38 UTC
Acknowledgments:

Name: the libssh2 project
Upstream: Chris Coulson (Canonical Ltd.)

Comment 7 Doran Moppert 2019-03-19 04:41:38 UTC
Statement:

This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers.

Comment 9 Dhananjay Arunesh 2019-03-19 06:35:07 UTC
External References:

https://www.libssh2.org/CVE-2019-3860.html

Comment 10 Dhananjay Arunesh 2019-03-19 06:47:23 UTC
Created libssh tracking bugs for this issue:

Affects: fedora-all [bug 1690246]


Created mingw-libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 1690247]

Comment 11 Dhananjay Arunesh 2019-03-19 06:48:53 UTC
Created mingw-libssh2 tracking bugs for this issue:

Affects: epel-7 [bug 1690248]

Comment 12 Andrej Nemec 2019-03-19 12:28:16 UTC
Created libssh2 tracking bugs for this issue:

Affects: fedora-all [bug 1690408]


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