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Bug 1271134 - (CVE-2015-7799) CVE-2015-7799 kernel: net: slip: crash when using PPP character device driver
CVE-2015-7799 kernel: net: slip: crash when using PPP character device driver
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20151008,reported=2...
: Security
Depends On: 1271135
Blocks: 1271136
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Reported: 2015-10-13 04:43 EDT by Martin Prpič
Modified: 2015-11-30 22:24 EST (History)
35 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was discovered in the Linux kernel where issuing certain ioctl() -s commands to the "/dev/ppp" device file could lead to a NULL pointer dereference. A privileged user could use this flaw to cause a kernel crash and denial of service.
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Last Closed: 2015-11-30 11:22:04 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpič 2015-10-13 04:43:34 EDT 
The following flaw was found in the Linux kernel:

In the process of using the PPP device driver, if the unit of the PPP device file has been created. On the basis of the above, the ioctl function is used to pass the PPPIOCSMAXCID command and the 0x67084000  parameter (parameters must be satisfied: arg>>16 > 255 and 0xFFFF&arg > 255), which will lead to the use of null pointers in the kernel.

References:

https://code.google.com/p/android/issues/detail?id=187973
http://seclists.org/oss-sec/2015/q4/53
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/net/slip/slhc.c?id=4ab42d78e37a294ac7bc56901d563c642e03c4ae
Comment 1 Martin Prpič 2015-10-13 04:44:25 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1271135]
Comment 2 Josh Boyer 2015-10-21 08:47:49 EDT 
Ben Hutchings posted a two patch series to fix this issue, however his mailer corrupted the patches according to the netdev maintainer.

https://www.mail-archive.com/netdev@vger.kernel.org/msg82709.html
Comment 4 Fedora Update System 2015-11-19 04:55:33 EST 
kernel-4.2.6-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2015-11-19 07:20:38 EST 
kernel-4.2.6-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2015-11-20 18:21:18 EST 
kernel-4.1.13-100.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
Comment 9 Vladis Dronov 2015-11-30 11:22:04 EST 
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2.

This has been rated as having Low security impact as privileged access is required to exploit it, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
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