Bug 980725 (CVE-2016-4913) - VUL-0: CVE-2016-4913: kernel: Information leak when handling NM entries containing NUL
Summary: VUL-0: CVE-2016-4913: kernel: Information leak when handling NM entries conta...
Status: RESOLVED FIXED
Alias: CVE-2016-4913
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Minor
Target Milestone: ---
Deadline: 2016-07-25
Assignee: Jeff Mahoney
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/169190/
Whiteboard: CVSSv2:SUSE:CVE-2016-4913:2.1:(AV:L/A...
Keywords:
Depends on:
Blocks:
 
Reported: 2016-05-19 13:04 UTC by Alexander Bergmann
Modified: 2021-11-24 10:13 UTC (History)
7 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Alexander Bergmann 2016-05-19 13:04:51 UTC 
rh#1337528

A vulnerability was found in the Linux kernel. Payloads of NM entries are not supposed to contain NUL. When such entry is processed, only the part prior to the first NUL goes into the concatenation (i.e. the directory entry name being encoded by a bunch of NM entries).  The process stops when the amount collected so far + the claimed amount in the current NM entry exceed 254.

However, the value returned as the total length is the sum of *claimed* sizes, not the actual amount collected.  And that can grow pretty large - not unlimited, since you'd need to put CE entries in between to be able to get more than the maximum that could be contained in one isofs directory entry / continuation chunk and the process stops once it had encountered 32 CEs, but you can get about 8Kb easily.  And that's what will be passed to readdir callback as the name length.  8Kb __copy_to_user() from a buffer allocated by __get_free_page()

References:

http://seclists.org/oss-sec/2016/q2/363

Upstream fix:

https://git.kernel.org/linus/99d825822eade8d827a1817357cbf3f889a552d6

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1337528
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4913
http://seclists.org/oss-sec/2016/q2/365
Comment 1 Swamp Workflow Management 2016-05-19 22:01:15 UTC 
bugbot adjusting priority
Comment 3 Xuanke Han 2016-06-06 09:04:39 UTC 
Does this vulnerability affect on SLES10 SPx and SLES11 SP1? 

Thanks,
Xuanke Han
Comment 10 Jeff Mahoney 2016-06-07 13:20:06 UTC 
Fix went into 4.6, so Tumbleweed is unaffected.

Stable backports have already landed in:
4.4.11 -> SLE12 SP2
3.12.60 -> SLE12 GA/SP1

That leaves openSUSE 13.2 and SLE11 SP4.
Comment 11 Jeff Mahoney 2016-06-07 14:13:04 UTC 
Fixes pushed to openSUSE-13.2 and users/jeffm/cve/linux-3.0/for-next.

Once those commits land, I'll close as FIXED.
Comment 12 Michal Hocko 2016-06-07 15:35:16 UTC 
(In reply to Jeff Mahoney from comment #11)
> Fixes pushed to openSUSE-13.2 and users/jeffm/cve/linux-3.0/for-next.
> 
> Once those commits land, I'll close as FIXED.

are you planning to push to cve/linux-2.6.16 as well?
Comment 13 Jeff Mahoney 2016-06-08 01:54:00 UTC 
Also pushed to cve/linux-2.6.16.  Thanks, Michal.
Comment 15 Swamp Workflow Management 2016-06-24 14:27:45 UTC 
SUSE-SU-2016:1672-1: An update that solves 29 vulnerabilities and has 61 fixes is now available.

Category: security (important)
Bug References: 676471,866130,898592,936530,940413,944309,946122,949752,953369,956491,956852,957986,957988,957990,959381,960458,960857,961512,961518,963762,963998,965319,965860,965923,966245,967863,967914,968010,968018,968141,968500,968566,968670,968687,969149,969391,969571,970114,970504,970892,970909,970911,970948,970956,970958,970970,971124,971125,971126,971360,971433,971446,971729,971944,971947,971989,972363,973237,973378,973556,973570,974646,974787,975358,975772,975945,976739,976868,978401,978821,978822,979213,979274,979347,979419,979548,979595,979867,979879,980371,980725,980788,980931,981231,981267,982532,982691,983143,983213,984107
CVE References: CVE-2015-7566,CVE-2015-8816,CVE-2016-0758,CVE-2016-1583,CVE-2016-2053,CVE-2016-2143,CVE-2016-2184,CVE-2016-2185,CVE-2016-2186,CVE-2016-2187,CVE-2016-2188,CVE-2016-2782,CVE-2016-2847,CVE-2016-3134,CVE-2016-3137,CVE-2016-3138,CVE-2016-3139,CVE-2016-3140,CVE-2016-3156,CVE-2016-4482,CVE-2016-4485,CVE-2016-4486,CVE-2016-4565,CVE-2016-4569,CVE-2016-4578,CVE-2016-4580,CVE-2016-4805,CVE-2016-4913,CVE-2016-5244
Sources used:
SUSE Linux Enterprise Software Development Kit 11-SP4 (src):    kernel-docs-3.0.101-77.2
SUSE Linux Enterprise Server 11-SP4 (src):    kernel-default-3.0.101-77.1, kernel-ec2-3.0.101-77.1, kernel-pae-3.0.101-77.1, kernel-ppc64-3.0.101-77.1, kernel-source-3.0.101-77.1, kernel-syms-3.0.101-77.1, kernel-trace-3.0.101-77.1, kernel-xen-3.0.101-77.1
SUSE Linux Enterprise Server 11-EXTRA (src):    kernel-default-3.0.101-77.1, kernel-pae-3.0.101-77.1, kernel-ppc64-3.0.101-77.1, kernel-trace-3.0.101-77.1, kernel-xen-3.0.101-77.1
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    kernel-default-3.0.101-77.1, kernel-ec2-3.0.101-77.1, kernel-pae-3.0.101-77.1, kernel-ppc64-3.0.101-77.1, kernel-trace-3.0.101-77.1, kernel-xen-3.0.101-77.1
Comment 18 Swamp Workflow Management 2016-07-18 14:16:13 UTC 
An update workflow for this issue was started.
This issue was rated as important.
Please submit fixed packages until 2016-07-25.
When done, reassign the bug to security-team@suse.de.
https://swamp.suse.de/webswamp/wf/62901
Comment 19 Jeff Mahoney 2016-08-02 15:01:39 UTC 
Commits landed a while ago.  Closing as FIXED.
Comment 20 Swamp Workflow Management 2016-08-08 18:19:12 UTC 
SUSE-SU-2016:1985-1: An update that solves 20 vulnerabilities and has 43 fixes is now available.

Category: security (important)
Bug References: 676471,866130,909589,936530,944309,950998,953369,954847,956491,957986,960857,961518,963762,966245,967914,968500,969149,969391,970114,971030,971126,971360,971446,971944,971947,971989,973378,974620,974646,974787,975358,976739,976868,978401,978821,978822,979213,979274,979347,979419,979548,979595,979867,979879,979915,980246,980371,980725,980788,980931,981231,981267,982532,982544,982691,983143,983213,983721,984107,984755,986362,986572,988498
CVE References: CVE-2015-7833,CVE-2016-0758,CVE-2016-1583,CVE-2016-2053,CVE-2016-2187,CVE-2016-3134,CVE-2016-3707,CVE-2016-4470,CVE-2016-4482,CVE-2016-4485,CVE-2016-4486,CVE-2016-4565,CVE-2016-4569,CVE-2016-4578,CVE-2016-4580,CVE-2016-4805,CVE-2016-4913,CVE-2016-4997,CVE-2016-5244,CVE-2016-5829
Sources used:
SUSE Linux Enterprise Real Time Extension 11-SP4 (src):    kernel-rt-3.0.101.rt130-57.1, kernel-rt_trace-3.0.101.rt130-57.1, kernel-source-rt-3.0.101.rt130-57.1, kernel-syms-rt-3.0.101.rt130-57.1
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    kernel-rt-3.0.101.rt130-57.1, kernel-rt_debug-3.0.101.rt130-57.1, kernel-rt_trace-3.0.101.rt130-57.1
Comment 21 Swamp Workflow Management 2016-08-24 13:19:46 UTC 
openSUSE-SU-2016:2144-1: An update that solves 53 vulnerabilities and has 28 fixes is now available.

Category: security (important)
Bug References: 901754,941113,942702,945219,955654,957052,957988,959709,960561,961512,963762,963765,966245,966437,966693,966849,967972,967973,967974,967975,968010,968011,968012,968013,968018,968670,969354,969355,970114,970275,970892,970909,970911,970948,970955,970956,970958,970970,971124,971125,971126,971360,971628,971799,971919,971944,972174,973378,973570,974308,974418,974646,975945,978401,978445,978469,978821,978822,979021,979213,979548,979867,979879,979913,980348,980363,980371,980725,981267,982706,983143,983213,984464,984755,984764,986362,986365,986377,986572,986573,986811
CVE References: CVE-2012-6701,CVE-2013-7446,CVE-2014-9904,CVE-2015-3288,CVE-2015-6526,CVE-2015-7566,CVE-2015-8709,CVE-2015-8785,CVE-2015-8812,CVE-2015-8816,CVE-2015-8830,CVE-2016-0758,CVE-2016-1583,CVE-2016-2053,CVE-2016-2184,CVE-2016-2185,CVE-2016-2186,CVE-2016-2187,CVE-2016-2188,CVE-2016-2384,CVE-2016-2543,CVE-2016-2544,CVE-2016-2545,CVE-2016-2546,CVE-2016-2547,CVE-2016-2548,CVE-2016-2549,CVE-2016-2782,CVE-2016-2847,CVE-2016-3134,CVE-2016-3136,CVE-2016-3137,CVE-2016-3138,CVE-2016-3139,CVE-2016-3140,CVE-2016-3156,CVE-2016-3672,CVE-2016-3689,CVE-2016-3951,CVE-2016-4470,CVE-2016-4482,CVE-2016-4485,CVE-2016-4486,CVE-2016-4565,CVE-2016-4569,CVE-2016-4578,CVE-2016-4580,CVE-2016-4581,CVE-2016-4805,CVE-2016-4913,CVE-2016-4997,CVE-2016-5244,CVE-2016-5829
Sources used:
openSUSE 13.2 (src):    bbswitch-0.8-3.20.3, cloop-2.639-14.20.3, crash-7.0.8-20.3, hdjmod-1.28-18.21.3, ipset-6.23-20.3, kernel-debug-3.16.7-42.1, kernel-default-3.16.7-42.1, kernel-desktop-3.16.7-42.1, kernel-docs-3.16.7-42.2, kernel-ec2-3.16.7-42.1, kernel-obs-build-3.16.7-42.2, kernel-obs-qa-3.16.7-42.1, kernel-obs-qa-xen-3.16.7-42.1, kernel-pae-3.16.7-42.1, kernel-source-3.16.7-42.1, kernel-syms-3.16.7-42.1, kernel-vanilla-3.16.7-42.1, kernel-xen-3.16.7-42.1, pcfclock-0.44-260.20.2, vhba-kmp-20140629-2.20.2, virtualbox-5.0.20-48.5, xen-4.4.4_02-46.2, xtables-addons-2.6-22.3
Comment 22 Swamp Workflow Management 2016-09-06 13:16:13 UTC 
SUSE-SU-2016:2245-1: An update that solves 25 vulnerabilities and has 22 fixes is now available.

Category: security (important)
Bug References: 839104,866130,919351,944309,950998,960689,962404,963655,963762,966460,969149,970114,971126,971360,971446,971729,971944,974428,975945,978401,978821,978822,979213,979274,979548,979681,979867,979879,980371,980725,980788,980931,981267,983143,983213,983535,984107,984755,986362,986365,986445,986572,987709,988065,989152,989401,991608
CVE References: CVE-2013-4312,CVE-2015-7513,CVE-2015-7833,CVE-2016-0758,CVE-2016-1583,CVE-2016-2053,CVE-2016-2187,CVE-2016-3134,CVE-2016-3955,CVE-2016-4470,CVE-2016-4482,CVE-2016-4485,CVE-2016-4486,CVE-2016-4565,CVE-2016-4569,CVE-2016-4578,CVE-2016-4580,CVE-2016-4805,CVE-2016-4913,CVE-2016-4997,CVE-2016-4998,CVE-2016-5244,CVE-2016-5696,CVE-2016-5829,CVE-2016-6480
Sources used:
SUSE OpenStack Cloud 5 (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-source-3.0.101-0.47.86.1, kernel-syms-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Manager Proxy 2.1 (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-source-3.0.101-0.47.86.1, kernel-syms-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Manager 2.1 (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-source-3.0.101-0.47.86.1, kernel-syms-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Linux Enterprise Server 11-SP3-LTSS (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-pae-3.0.101-0.47.86.1, kernel-source-3.0.101-0.47.86.1, kernel-syms-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Linux Enterprise Server 11-EXTRA (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-pae-3.0.101-0.47.86.1, kernel-ppc64-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Linux Enterprise Point of Sale 11-SP3 (src):    kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-pae-3.0.101-0.47.86.1, kernel-source-3.0.101-0.47.86.1, kernel-syms-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
SUSE Linux Enterprise Debuginfo 11-SP3 (src):    kernel-bigsmp-3.0.101-0.47.86.1, kernel-default-3.0.101-0.47.86.1, kernel-ec2-3.0.101-0.47.86.1, kernel-pae-3.0.101-0.47.86.1, kernel-trace-3.0.101-0.47.86.1, kernel-xen-3.0.101-0.47.86.1
Comment 23 Swamp Workflow Management 2017-01-30 19:21:42 UTC 
SUSE-SU-2017:0333-1: An update that solves 46 vulnerabilities and has 31 fixes is now available.

Category: security (important)
Bug References: 1003077,1003925,1004517,1007944,1008645,1008831,1008833,1009443,1010150,1010467,1010501,1010507,1010711,1010716,1011482,1011685,1012422,1012832,1013038,1013531,1013542,1014746,1017710,1021258,835175,839104,863873,874145,896484,908069,914939,922947,927287,940966,950998,954984,956514,958000,960689,963053,967716,968500,969340,971360,971944,978401,978821,979213,979274,979548,979595,979879,979915,980363,980371,980725,981267,983143,983213,984755,986362,986365,986445,986572,989261,991608,991665,992566,993890,993891,994296,994436,994618,994759,995968,997059,999932
CVE References: CVE-2004-0230,CVE-2012-6704,CVE-2013-4312,CVE-2015-1350,CVE-2015-7513,CVE-2015-7833,CVE-2015-8956,CVE-2015-8962,CVE-2015-8964,CVE-2016-0823,CVE-2016-10088,CVE-2016-1583,CVE-2016-2187,CVE-2016-2189,CVE-2016-3841,CVE-2016-4470,CVE-2016-4482,CVE-2016-4485,CVE-2016-4565,CVE-2016-4569,CVE-2016-4578,CVE-2016-4580,CVE-2016-4805,CVE-2016-4913,CVE-2016-4997,CVE-2016-4998,CVE-2016-5244,CVE-2016-5829,CVE-2016-6480,CVE-2016-6828,CVE-2016-7042,CVE-2016-7097,CVE-2016-7117,CVE-2016-7425,CVE-2016-7910,CVE-2016-7911,CVE-2016-7916,CVE-2016-8399,CVE-2016-8632,CVE-2016-8633,CVE-2016-8646,CVE-2016-9555,CVE-2016-9685,CVE-2016-9756,CVE-2016-9793,CVE-2017-5551
Sources used:
SUSE Linux Enterprise Server 11-SP2-LTSS (src):    kernel-default-3.0.101-0.7.53.1, kernel-ec2-3.0.101-0.7.53.1, kernel-pae-3.0.101-0.7.53.1, kernel-source-3.0.101-0.7.53.1, kernel-syms-3.0.101-0.7.53.1, kernel-trace-3.0.101-0.7.53.1, kernel-xen-3.0.101-0.7.53.1
SUSE Linux Enterprise Debuginfo 11-SP2 (src):    kernel-default-3.0.101-0.7.53.1, kernel-ec2-3.0.101-0.7.53.1, kernel-pae-3.0.101-0.7.53.1, kernel-trace-3.0.101-0.7.53.1, kernel-xen-3.0.101-0.7.53.1