medium
4.9
CWE
476
Advisory Published
CVE Published
Updated

CVE-2016-2782: Null Pointer Dereference

First published: Sun Feb 28 2016(Updated: )

A local kernel crash on invalid USB device requiring the visor driver was reported. The treo_attach() function of the [visor] driver, which is called during the driver initialization process, was dereferencing the bulk-in and interrupt-in urbs without first making sure they had been allocated by core. Due to an incomplete sanity check, the visor driver tries to dereference null-pointers, which results in crash. Vulnerable code: **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/visor.c) ... 554 #define COPY_PORT(dest, src) \ 555 do { \ 556 int i; \ 557 \ 558 for (i = 0; i &lt; ARRAY_SIZE(src-&gt;read_urbs); ++i) { \ 559 dest-&gt;read_urbs[i] = src-&gt;read_urbs[i]; \ /* Possible Nullpointer-Dereference */ 560 dest-&gt;read_urbs[i]-&gt;context = dest; \ 561 dest-&gt;bulk_in_buffers[i] = src-&gt;bulk_in_buffers[i]; \ 562 } \ 563 dest-&gt;read_urb = src-&gt;read_urb; \ 564 dest-&gt;bulk_in_endpointAddress = src-&gt;bulk_in_endpointAddress;\ 565 dest-&gt;bulk_in_buffer = src-&gt;bulk_in_buffer; \ 566 dest-&gt;bulk_in_size = src-&gt;bulk_in_size; \ 567 dest-&gt;interrupt_in_urb = src-&gt;interrupt_in_urb; \ 568 dest-&gt;interrupt_in_urb-&gt;context = dest; \ 569 dest-&gt;interrupt_in_endpointAddress = \ 570 src-&gt;interrupt_in_endpointAddress;\ 571 dest-&gt;interrupt_in_buffer = src-&gt;interrupt_in_buffer; \ 572 } while (0); 573 574 swap_port = kmalloc(sizeof(*swap_port), GFP_KERNEL); 575 if (!swap_port) 576 return -ENOMEM; 577 COPY_PORT(swap_port, serial-&gt;port[0]); /* no sanity-check! */ 578 COPY_PORT(serial-&gt;port[0], serial-&gt;port[1]); /* no sanity-check! */ 579 COPY_PORT(serial-&gt;port[1], swap_port); /* no sanity-check! */ ... **** Reproducer can be found in original bug report: <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED WONTFIX - CVE-2016-2782 Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on invalid USB device descriptors (visor driver) [local-DoS]" href="show_bug.cgi?id=1283374">https://bugzilla.redhat.com/show_bug.cgi?id=1283374</a> An upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb3232138e37129e88240a98a1d2aba2187ff57c">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb3232138e37129e88240a98a1d2aba2187ff57c</a> Public via: <a href="http://seclists.org/bugtraq/2016/Mar/86">http://seclists.org/bugtraq/2016/Mar/86</a> CVE-ID request and assignment: <a href="http://seclists.org/oss-sec/2016/q1/456">http://seclists.org/oss-sec/2016/q1/456</a> <a href="http://seclists.org/oss-sec/2016/q1/458">http://seclists.org/oss-sec/2016/q1/458</a>

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<4.5.0
Linux Linux kernel=4.5.0-rc1
SUSE Linux Enterprise Debuginfo=11-sp2
SUSE Linux Enterprise Debuginfo=11-sp4
Suse Linux Enterprise Module For Public Cloud=12
SUSE Linux Enterprise Desktop=12
SUSE Linux Enterprise Desktop=12-sp1
Suse Linux Enterprise Real Time Extension=11-sp4
Suse Linux Enterprise Real Time Extension=12-sp1
SUSE Linux Enterprise Server=11-sp2
SUSE Linux Enterprise Server=11-sp4
SUSE Linux Enterprise Server=12
SUSE Linux Enterprise Server=12-sp1
SUSE Linux Enterprise Software Development Kit=11-sp4
SUSE Linux Enterprise Software Development Kit=12
SUSE Linux Enterprise Software Development Kit=12-sp1
Suse Linux Enterprise Workstation Extension=12
Suse Linux Enterprise Workstation Extension=12-sp1
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cac9b50b0d75a1d50d6c056ff65c005f3224c8e0

Remedy

https://github.com/torvalds/linux/commit/cac9b50b0d75a1d50d6c056ff65c005f3224c8e0

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Reference Links

Frequently Asked Questions

  • What is CVE-2016-2782?

    CVE-2016-2782 is a vulnerability in the Linux kernel before version 4.5 that allows physically proximate attackers to cause a denial of service or possibly have unspecified other impact by inserting a USB device without a bulk-in or interrupt endpoint.

  • How severe is CVE-2016-2782?

    CVE-2016-2782 has a severity level of low.

  • How can I fix CVE-2016-2782?

    To fix CVE-2016-2782, update your Linux kernel to version 4.5 or later.

  • Are there any exploits available for CVE-2016-2782?

    Yes, there is an exploit available for CVE-2016-2782. You can find it at the following link: https://www.exploit-db.com/exploits/39539/

  • Where can I find more information about CVE-2016-2782?

    You can find more information about CVE-2016-2782 at the following links: http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00019.html, http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00052.html

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