Vulnerabilities > CVE-2017-13139 - Out-of-bounds Read vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
In ImageMagick before 6.9.9-0 and 7.x before 7.0.6-1, the ReadOneMNGImage function in coders/png.c has an out-of-bounds read with the MNG CLIP chunk.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Overread Buffers An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.
Nessus
NASL family Huawei Local Security Checks NASL id EULEROS_SA-2020-1390.NASL description According to the versions of the ImageMagick packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - ImageMagick is an image display and manipulation tool for the X Window System. ImageMagick can read and write JPEG, TIFF, PNM, GIF, and Photo CD image formats. It can resize, rotate, sharpen, color reduce, or add special effects to an image, and when finished you can either save the completed work in the original format or a different one. ImageMagick also includes command line programs for creating animated or transparent .gifs, creating composite images, creating thumbnail images, and more. ImageMagick is one of your choices if you need a program to manipulate and display images. If you want to develop your own applications which use ImageMagick code or APIs, you need to install ImageMagick-devel as well.Security Fix(es):The HorizontalFilter function in resize.c in ImageMagick before 6.8.9-9 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted image file.(CVE-2014-8354)PCX parser code in ImageMagick before 6.8.9-9 allows remote attackers to cause a denial of service (out-of-bounds read).(CVE-2014-8355)DCM decode in ImageMagick before 6.8.9-9 allows remote attackers to cause a denial of service (out-of-bounds read).(CVE-2014-8562)The JPEG decoder in ImageMagick before 6.8.9-9 allows local users to cause a denial of service (out-of-bounds memory access and crash).(CVE-2014-8716)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted xpm file.(CVE-2014-9821)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted quantum file.(CVE-2014-9822)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted palm file, a different vulnerability than CVE-2014-9819.(CVE-2014-9823)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted psd file, a different vulnerability than CVE-2014-9825.(CVE-2014-9824)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted psd file, a different vulnerability than CVE-2014-9824.(CVE-2014-9825)coders/pnm.c in ImageMagick 6.9.0-1 Beta and earlier allows remote attackers to cause a denial of service (crash) via a crafted png file.(CVE-2014-9837)distribute-cache.c in ImageMagick re-uses objects after they have been destroyed, which allows remote attackers to have unspecified impact via unspecified vectors.(CVE-2014-9852)Memory leak in coders/rle.c in ImageMagick allows remote attackers to cause a denial of service (memory consumption) via a crafted rle file.(CVE-2014-9853)coders/tiff.c in ImageMagick allows remote attackers to cause a denial of service (application crash) via vectors related to the last seen 2020-05-06 modified 2020-04-15 plugin id 135519 published 2020-04-15 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135519 title EulerOS 2.0 SP3 : ImageMagick (EulerOS-SA-2020-1390) NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-1199.NASL description This update for GraphicsMagick fixes the following issues : - CVE-2017-13775: Fixed a denial of service issue in ReadJNXImage() in coders/jnx.c (boo#1056431) - CVE-2017-13063: Fixed a heap-based buffer overflow vulnerability in the function GetStyleTokens in coders/svg.c (bsc#1055050) - CVE-2017-13064: Fixed a heap-based buffer overflow vulnerability in the function GetStyleTokens in coders/svg.c (bsc#1055042) - CVE-2017-12936: The ReadWMFImage function in coders/wmf.c in GraphicsMagick had a use-after-free issue for data associated with exception reporting. (bsc#1054598) - CVE-2017-13139: The ReadOneMNGImage function in coders/png.c had an out-of-bounds read with the MNG CLIP chunk. (bsc#1055430) - CVE-2017-12937: The ReadSUNImage function in coders/sun.c in GraphicsMagick had a colormap heap-based buffer over-read. (bsc#1054596) last seen 2020-06-05 modified 2017-10-30 plugin id 104235 published 2017-10-30 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/104235 title openSUSE Security Update : GraphicsMagick (openSUSE-2017-1199) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201711-07.NASL description The remote host is affected by the vulnerability described in GLSA-201711-07 (ImageMagick: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in ImageMagick. Please review the referenced CVE identifiers for details. Impact : Remote attackers, by enticing a user to process a specially crafted file, could obtain sensitive information, cause a Denial of Service condition, or have other unspecified impacts. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 104515 published 2017-11-13 reporter This script is Copyright (C) 2017-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/104515 title GLSA-201711-07 : ImageMagick: Multiple vulnerabilities NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3681-1.NASL description It was discovered that ImageMagick incorrectly handled certain malformed image files. If a user or automated system using ImageMagick were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or possibly execute code with the privileges of the user invoking the program. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 110516 published 2018-06-13 reporter Ubuntu Security Notice (C) 2018-2019 Canonical, Inc. / NASL script (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110516 title Ubuntu 14.04 LTS / 16.04 LTS / 17.10 / 18.04 LTS : imagemagick vulnerabilities (USN-3681-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2017-1270.NASL description This update for ImageMagick fixes the following issues : Security issues fixed : - CVE-2017-15033: A denial of service attack (memory leak) was fixed in ReadYUVImage in coders/yuv.c [bsc#1061873] - CVE-2017-11446: An infinite loop in ReadPESImage was fixed. (bsc#1049379) - CVE-2017-12433: A memory leak in ReadPESImage in coders/pes.c was fixed. (bsc#1052545) - CVE-2017-12428: A memory leak in ReadWMFImage in coders/wmf.c was fixed. (bsc#1052249) - CVE-2017-12431: A use-after-free in ReadWMFImage was fixed. (bsc#1052253) - CVE-2017-11534: A memory leak in the lite_font_map() in coders/wmf.c was fixed. (bsc#1050135) - CVE-2017-13133: A memory exhaustion in load_level function in coders/xcf.c was fixed. (bsc#1055219) - CVE-2017-13139: A out-of-bounds read in the ReadOneMNGImage was fixed. (bsc#1055430) This update also reverts an incorrect fix for CVE-2016-7530 [bsc#1054924]. This update was imported from the SUSE:SLE-12:Update update project. last seen 2020-06-05 modified 2017-11-13 plugin id 104528 published 2017-11-13 reporter This script is Copyright (C) 2017-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/104528 title openSUSE Security Update : ImageMagick (openSUSE-2017-1270) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2354.NASL description According to the versions of the ImageMagick packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - ImageMagick is an image display and manipulation tool for the X Window System. ImageMagick can read and write JPEG, TIFF, PNM, GIF,and Photo CD image formats. It can resize, rotate, sharpen, color reduce, or add special effects to an image, and when finished you can either save the completed work in the original format or a different one. ImageMagick also includes command line programs for creating animated or transparent .gifs, creating composite images, creating thumbnail images, and more.ImageMagick is one of your choices if you need a program to manipulate and display images. If you want to develop your own applications which use ImageMagick code or APIs, you need to install ImageMagick-devel as well.Security Fix(es):In ImageMagick before 7.0.8-25, some memory leaks exist in DecodeImage in coders/pcd.c.(CVE-2019-7175)ReadXBMImage in coders/xbm.c in ImageMagick before 7.0.8-9 leaves data uninitialized when processing an XBM file that has a negative pixel value. If the affected code is used as a library loaded into a process that includes sensitive information, that information sometimes can be leaked via the image data.(CVE-2018-16323)In ImageMagick before 7.0.8-8, a NULL pointer dereference exists in the CheckEventLogging function in MagickCore/log.c.(CVE-2018-16328)The DrawDashPolygon function in MagickCore/draw.c in ImageMagick before 6.9.4-0 and 7.x before 7.0.1-2 mishandles calculations of certain vertices integer data, which allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.(CVE-2016-4562)The TraceStrokePolygon function in MagickCore/draw.c in ImageMagick before 6.9.4-0 and 7.x before 7.0.1-2 mishandles the relationship between the BezierQuantum value and certain strokes data, which allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.(CVE-2016-4563)The DrawImage function in MagickCore/draw.c in ImageMagick before 6.9.4-0 and 7.x before 7.0.1-2 makes an incorrect function call in attempting to locate the next token, which allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.(CVE-2016-4564 )The ReadCINImage function in coders/cin.c in ImageMagick before 6.9.9-0 and 7.x before 7.0.6-1 allows remote attackers to cause a denial of service (memory consumption) via a crafted file.(CVE-2017-11525)In coders/bmp.c in ImageMagick before 7.0.8-16, an input file can result in an infinite loop and hang, with high CPU and memory consumption. Remote attackers could leverage this vulnerability to cause a denial of service via a crafted file.(CVE-2018-20467)coders/pnm.c in ImageMagick 6.9.0-1 Beta and earlier allows remote attackers to cause a denial of service (crash) via a crafted png file.(CVE-2014-9837)coders/sun.c in ImageMagick before 6.9.0-4 Beta allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted SUN file.(CVE-2015-8958)Memory leak in the ReadPSDLayers function in coders/psd.c in ImageMagick before 6.9.6-3 allows remote attackers to cause a denial of service (memory consumption) via a crafted image file.(CVE-2016-10058)The MSL interpreter in ImageMagick before 6.9.6-4 allows remote attackers to cause a denial of service (segmentation fault and application crash) via a crafted XML file.(CVE-2016-10068)The ReadDCMImage function in DCM reader in ImageMagick before 6.9.4-5 and 7.x before 7.0.1-7 allows remote attackers to have unspecified impact via vectors involving the for statement in computing the pixel scaling table.(CVE-2016-5690)Heap-based buffer overflow in coders/hdr.c in ImageMagick allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted HDR file.(CVE-2016-7520)MagickCore/profile.c in ImageMagick before 7.0.3-2 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted file.(CVE-2016-7799)The ReadOneMNGImage function in coders/png.c in ImageMagick before 6.9.9-0 and 7.x before 7.0.6-1 allows remote attackers to cause a denial of service (large loop and CPU consumption) via a crafted file.(CVE-2017-11526)In ImageMagick before 6.9.7-6 and 7.x before 7.0.4-6, the ReadMATImage function in coders/mat.c uses uninitialized data, which might allow remote attackers to obtain sensitive information from process memory.(CVE-2017-13143)coders/psd.c in ImageMagick allows remote attackers to have unspecified impact via a crafted PSD file, which triggers an out-of-bounds write.(CVE-2017-5510)In the ReadDCMImage function in coders/dcm.c in ImageMagick before 7.0.7-23, each redmap, greenmap, and bluemap variable can be overwritten by a new pointer. The previous pointer is lost, which leads to a memory leak. This allows remote attackers to cause a denial of service.(CVE-2018-6405)Heap-based buffer overflow in ImageMagick allows remote attackers to have unspecified impact via a crafted psd file, a different vulnerability than CVE-2014-9824.(CVE-2014-9825)Buffer overflow in ImageMagick before 6.9.0-4 Beta allows remote attackers to cause a denial of service (application crash) via a crafted SUN file.(CVE-2015-8957)Buffer overflow in the WriteGROUP4Image function in coders/tiff.c in ImageMagick before 6.9.5-8 allows remote attackers to cause a denial of service (application crash) or have other unspecified impact via a crafted file.(CVE-2016-10057)magick/memory.c in ImageMagick before 6.9.4-5 allows remote attackers to cause a denial of service (application crash) via vectors involving last seen 2020-05-08 modified 2019-12-10 plugin id 131846 published 2019-12-10 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131846 title EulerOS 2.0 SP2 : ImageMagick (EulerOS-SA-2019-2354) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2160.NASL description According to the versions of the ImageMagick packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - ImageMagick is an image display and manipulation tool for the X Window System. ImageMagick can read and write JPEG, TIFF, PNM, GIF,and Photo CD image formats. It can resize, rotate, sharpen, color reduce, or add special effects to an image, and when finished you can either save the completed work in the original format or a different one. ImageMagick also includes command line programs for creating animated or transparent .gifs, creating composite images, creating thumbnail images, and more.ImageMagick is one of your choices if you need a program to manipulate and display images. If you want to develop your own applications which use ImageMagick code or APIs, you need to install ImageMagick-devel as well.Security Fix(es):In ImageMagick before 7.0.8-8, a NULL pointer dereference exists in the GetMagickProperty function in MagickCore/property.c.(CVE-2018-16329)ImageMagick before 6.9.9-24 and 7.x before 7.0.7-12 has a use-after-free in Magick::Image::read in Magick++/lib/Image.cpp.(CVE-2017-17499)In ImageMagick before 6.9.8-5 and 7.x before 7.0.5-6, there is a memory leak in the ReadMATImage function in coders/mat.c.(CVE-2017-13146)In ImageMagick before 6.9.7-6 and 7.x before 7.0.4-6, the ReadMATImage function in coders/mat.c uses uninitialized data, which might allow remote attackers to obtain sensitive information from process memory.(CVE-2017-13143)In ImageMagick before 6.9.9-0 and 7.x before 7.0.6-1, the ReadOneMNGImage function in coders/png.c has an out-of-bounds read with the MNG CLIP chunk.(CVE-2017-13139)coders/psd.c in ImageMagick allows remote attackers to have unspecified impact via a crafted PSD file, which triggers an out-of-bounds write.(CVE-2017-5510)coders/psd.c in ImageMagick allows remote attackers to have unspecified impact via a crafted PSD file, which triggers an out-of-bounds write.(CVE-2017-5509)Memory leak in coders/mpc.c in ImageMagick before 6.9.7-4 and 7.x before 7.0.4-4 allows remote attackers to cause a denial of service (memory consumption) via vectors involving a pixel cache.(CVE-2017-5507)Memory leak in the IsOptionMember function in MagickCore/option.c in ImageMagick before 6.9.2-2, as used in ODR-PadEnc and other products, allows attackers to trigger memory consumption.(CVE-2016-10252)Off-by-one error in coders/wpg.c in ImageMagick allows remote attackers to have unspecified impact via vectors related to a string copy.(CVE-2016-10145)Memory leak in AcquireVirtualMemory in ImageMagick before 7 allows remote attackers to cause a denial of service (memory consumption) via unspecified vectors.(CVE-2016-7539)In coders/bmp.c in ImageMagick before 7.0.8-16, an input file can result in an infinite loop and hang, with high CPU and memory consumption. Remote attackers could leverage this vulnerability to cause a denial of service via a crafted file.(CVE-2018-20467)In ImageMagick before 7.0.8-8, a NULL pointer dereference exists in the CheckEventLogging function in MagickCore/log.c.(CVE-2018-16328)ReadXBMImage in coders/xbm.c in ImageMagick before 7.0.8-9 leaves data uninitialized when processing an XBM file that has a negative pixel value. If the affected code is used as a library loaded into a process that includes sensitive information, that information sometimes can be leaked via the image data.(CVE-2018-16323)WriteEPTImage in coders/ept.c in ImageMagick 7.0.7-25 Q16 allows remote attackers to cause a denial of service (MagickCore/memory.c double free and application crash) or possibly have unspecified other impact via a crafted file.(CVE-2018-8804)In ImageMagick 7.0.8-3 Q16, ReadDIBImage and WriteDIBImage in coders/dib.c allow attackers to cause an out of bounds write via a crafted file.(CVE-2018-12600)ImageMagick version 7.0.7-2 contains a memory leak in ReadYUVImage in coders/yuv.c.(CVE-2017-15033) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-08 modified 2019-11-12 plugin id 130869 published 2019-11-12 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130869 title EulerOS 2.0 SP5 : ImageMagick (EulerOS-SA-2019-2160) NASL family SuSE Local Security Checks NASL id SUSE_SU-2017-3168-1.NASL description This update for ImageMagick fixes several issues. These security issues were fixed : - CVE-2017-11534: Processing a crafted file in convert could have lead to a Memory Leak in the lite_font_map() function in coders/wmf.c (bsc#1050135). - CVE-2017-13133: The load_level function in coders/xcf.c lacked offset validation, which allowed attackers to cause a denial of service (load_tile memory exhaustion) via a crafted file (bsc#1055219). - CVE-2017-13139: The ReadOneMNGImage function in coders/png.c had an out-of-bounds read with the MNG CLIP chunk (bsc#1055430). - CVE-2017-15033: Fixed a memory leak in ReadYUVImage in coders/yuv.c (bsc#1061873). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 104966 published 2017-12-01 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104966 title SUSE SLES11 Security Update : ImageMagick (SUSE-SU-2017:3168-1) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4019.NASL description This update fixes several vulnerabilities in imagemagick: Various memory handling problems and cases of missing or incomplete input sanitising may result in denial of service, memory disclosure or the execution of arbitrary code if malformed image files are processed. last seen 2020-06-01 modified 2020-06-02 plugin id 104403 published 2017-11-06 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104403 title Debian DSA-4019-1 : imagemagick - security update NASL family Debian Local Security Checks NASL id DEBIAN_DLA-1081.NASL description This updates fixes numerous vulnerabilities in imagemagick: Various memory handling problems and cases of missing or incomplete input sanitising may result in denial of service, memory disclosure or the execution of arbitrary code if malformed DPX, RLE, CIN, DIB, EPT, MAT, VST, PNG, JNG, MNG, DVJU, JPEG, TXT, PES, MPC, UIL, PS, PALM, CIP, TIFF, ICON, MAGICK, DCM, MSL, WMF, MIFF, PCX, SUN, PSD, MVG, PWP, PICT, PDB, SFW, or XCF files are processed. For Debian 7 last seen 2020-03-17 modified 2017-09-01 plugin id 102889 published 2017-09-01 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/102889 title Debian DLA-1081-1 : imagemagick security update NASL family SuSE Local Security Checks NASL id SUSE_SU-2017-2949-1.NASL description This update for ImageMagick fixes the following issues: Security issues fixed : - CVE-2017-15033: A denial of service attack (memory leak) was fixed in ReadYUVImage in coders/yuv.c [bsc#1061873] - CVE-2017-11446: An infinite loop in ReadPESImage was fixed. (bsc#1049379) - CVE-2017-12433: A memory leak in ReadPESImage in coders/pes.c was fixed. (bsc#1052545) - CVE-2017-12428: A memory leak in ReadWMFImage in coders/wmf.c was fixed. (bsc#1052249) - CVE-2017-12431: A use-after-free in ReadWMFImage was fixed. (bsc#1052253) - CVE-2017-11534: A memory leak in the lite_font_map() in coders/wmf.c was fixed. (bsc#1050135) - CVE-2017-13133: A memory exhaustion in load_level function in coders/xcf.c was fixed. (bsc#1055219) - CVE-2017-13139: A out-of-bounds read in the ReadOneMNGImage was fixed. (bsc#1055430) This update also reverts an incorrect fix for CVE-2016-7530 [bsc#1054924]. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 104474 published 2017-11-09 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104474 title SUSE SLED12 / SLES12 Security Update : ImageMagick (SUSE-SU-2017:2949-1) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4040.NASL description This update fixes several vulnerabilities in imagemagick: Various memory handling problems and cases of missing or incomplete input sanitising may result in denial of service, memory disclosure or the execution of arbitrary code if malformed image files are processed. last seen 2020-06-01 modified 2020-06-02 plugin id 104684 published 2017-11-20 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104684 title Debian DSA-4040-1 : imagemagick - security update
References
- http://www.securityfocus.com/bid/100494
- http://www.securityfocus.com/bid/100494
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870109
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870109
- https://github.com/ImageMagick/ImageMagick/commit/d072ed6aff835c174e856ce3a428163c0da9e8f4
- https://github.com/ImageMagick/ImageMagick/commit/d072ed6aff835c174e856ce3a428163c0da9e8f4
- https://security.gentoo.org/glsa/201711-07
- https://security.gentoo.org/glsa/201711-07
- https://usn.ubuntu.com/3681-1/
- https://usn.ubuntu.com/3681-1/
- https://www.debian.org/security/2017/dsa-4019
- https://www.debian.org/security/2017/dsa-4019
- https://www.debian.org/security/2017/dsa-4040
- https://www.debian.org/security/2017/dsa-4040