Bug 1783534 (CVE-2019-19533) - CVE-2019-19533 kernel: information leak bug caused by a malicious USB device in the drivers/media/usb/ttusb-dec/ttusb_dec.c
Summary: CVE-2019-19533 kernel: information leak bug caused by a malicious USB device...
Keywords:
Status: NEW
Alias: CVE-2019-19533
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1788005 1788006 1783536 1788002 1788003 1788004
Blocks: 1783535
TreeView+ depends on / blocked
 
Reported: 2019-12-13 21:26 UTC by msiddiqu
Modified: 2020-02-18 16:30 UTC (History)
45 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An information leak flaw was found in the Linux kernel's USB digital video device driver. An attacker with a malicious USB device presenting itself as a 'Technotrend/Hauppauge USB DEC' device is able to issue commands to this specific device and leak kernel internal memory information. The highest threat from this vulnerability is a breach of data confidentiality.
Clone Of:
Environment:
Last Closed:


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Description msiddiqu 2019-12-13 21:26:22 UTC
An information leak ina driver in the Linux kernel was found which can be exploited by malicious USB device being attached presenting itself as "Technotrend/Hauppauge USB DEC" device.

A local attacker who is able to issue commands to this specific device is able to leak kernel internal memory information.

Upstream Patch:
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a10feaf8c464c3f9cfdd3a8a7ce17e1c0d498da1

References: 

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4
http://seclists.org/oss-sec/2019/q4/115  
http://www.openwall.com/lists/oss-security/2019/12/03/4

Comment 1 msiddiqu 2019-12-13 21:28:33 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1783536]

Comment 2 Justin M. Forbes 2019-12-16 17:14:14 UTC
This was fixed for Fedora with the 5.3.4 stable kernel update.

Comment 9 Eric Christensen 2020-01-09 02:11:31 UTC
Mitigation:

As the ttusb_dec module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:

# echo "install ttusb_dec /bin/true" >> /etc/modprobe.d/disable-cifs.conf 
 
The system will need to be restarted if the ttusb_dec module is already loaded. In most circumstances, the CIFS kernel module will be unable to be unloaded while the device is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.


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