CVE-2016-6301

The recv_and_process_client_pkt function in networking/ntpd.c in busybox allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged NTP packet, which triggers a communication loop.

The busybox NTP implementation doesn't check the NTP mode of packets received on the server port and responds to any packet with the right size. This includes responses from another NTP server. An attacker can send a packet with a spoofed source address in order to create an infinite loop of responses between two busybox NTP servers. Adding more packets to the loop increases the traffic between the servers until one of them has a fully loaded CPU and/or network (CVE-2016-6301).

The affected code originated from openntpd, which had fixed it upstream, but the fix had not made it into Mageia's openntpd package. It has also been patched with the fix in this update.

This update for busybox fixes the following issues:

• CVE-2011-5325: Fixed tar directory traversal (bsc#951562).
• CVE-2015-9261: Fixed segfalts and application crashes in huft_build (bsc#1102912).
• CVE-2016-2147: Fixed out of bounds write (heap) due to integer underflow in udhcpc (bsc#970663).
• CVE-2016-2148: Fixed heap-based buffer overflow in OPTION_6RD parsing (bsc#970662).
• CVE-2016-6301: Fixed NTP server denial of service flaw (bsc#991940).
• CVE-2017-15873: Fixed integer overflow in get_next_block function in archival/libarchive/decompress_bunzip2.c (bsc#1064976).
• CVE-2017-15874: Fixed integer underflow in archival/libarchive/decompress_unlzma.c (bsc#1064978).
• CVE-2017-16544: Fixed Insufficient sanitization of filenames when autocompleting (bsc#1069412).
• CVE-2018-1000500 : Fixed missing SSL certificate validation in wget (bsc#1099263).
• CVE-2018-1000517: Fixed heap-based buffer overflow in the retrieve_file_data() (bsc#1099260).
• CVE-2018-20679: Fixed out of bounds read in udhcp (bsc#1121426).
• CVE-2019-5747: Fixed out of bounds read in udhcp components (bsc#1121428).
• CVE-2021-28831: Fixed invalid free or segmentation fault via malformed gzip data (bsc#1184522).
• CVE-2021-42373: Fixed NULL pointer dereference in man leading to DoS when a section name is supplied but no page argument is given (bsc#1192869).
• CVE-2021-42374: Fixed out-of-bounds heap read in unlzma leading to information leak and DoS when crafted LZMA-compressed input is decompressed (bsc#1192869).
• CVE-2021-42375: Fixed incorrect handling of a special element in ash leading to DoS when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters (bsc#1192869).
• CVE-2021-42376: Fixed NULL pointer dereference in hush leading to DoS when processing a crafted shell command (bsc#1192869).
• CVE-2021-42377: Fixed attacker-controlled pointer free in hush leading to DoS and possible code execution when processing a crafted shell command (bsc#1192869).
• CVE-2021-42378: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_i function (bsc#1192869).
• CVE-2021-42379: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the next_input_file function (bsc#1192869).
• CVE-2021-42380: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the clrvar function (bsc#1192869).
• CVE-2021-42381: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the hash_init function (bsc#1192869).
• CVE-2021-42382: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_s function (bsc#1192869).
• CVE-2021-42383: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42384: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the handle_special function (bsc#1192869).
• CVE-2021-42385: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42386: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the nvalloc function (bsc#1192869).

These are all security issues fixed in the busybox-1.35.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for busybox fixes the following issues:

• CVE-2011-5325: Fixed tar directory traversal (bsc#951562).
• CVE-2015-9261: Fixed segfalts and application crashes in huft_build (bsc#1102912).
• CVE-2016-2147: Fixed out of bounds write (heap) due to integer underflow in udhcpc (bsc#970663).
• CVE-2016-2148: Fixed heap-based buffer overflow in OPTION_6RD parsing (bsc#970662).
• CVE-2016-6301: Fixed NTP server denial of service flaw (bsc#991940).
• CVE-2017-15873: Fixed integer overflow in get_next_block function in archival/libarchive/decompress_bunzip2.c (bsc#1064976).
• CVE-2017-15874: Fixed integer underflow in archival/libarchive/decompress_unlzma.c (bsc#1064978).
• CVE-2017-16544: Fixed Insufficient sanitization of filenames when autocompleting (bsc#1069412).
• CVE-2018-1000500 : Fixed missing SSL certificate validation in wget (bsc#1099263).
• CVE-2018-1000517: Fixed heap-based buffer overflow in the retrieve_file_data() (bsc#1099260).
• CVE-2018-20679: Fixed out of bounds read in udhcp (bsc#1121426).
• CVE-2019-5747: Fixed out of bounds read in udhcp components (bsc#1121428).
• CVE-2021-28831: Fixed invalid free or segmentation fault via malformed gzip data (bsc#1184522).
• CVE-2021-42373: Fixed NULL pointer dereference in man leading to DoS when a section name is supplied but no page argument is given (bsc#1192869).
• CVE-2021-42374: Fixed out-of-bounds heap read in unlzma leading to information leak and DoS when crafted LZMA-compressed input is decompressed (bsc#1192869).
• CVE-2021-42375: Fixed incorrect handling of a special element in ash leading to DoS when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters (bsc#1192869).
• CVE-2021-42376: Fixed NULL pointer dereference in hush leading to DoS when processing a crafted shell command (bsc#1192869).
• CVE-2021-42377: Fixed attacker-controlled pointer free in hush leading to DoS and possible code execution when processing a crafted shell command (bsc#1192869).
• CVE-2021-42378: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_i function (bsc#1192869).
• CVE-2021-42379: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the next_input_file function (bsc#1192869).
• CVE-2021-42380: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the clrvar function (bsc#1192869).
• CVE-2021-42381: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the hash_init function (bsc#1192869).
• CVE-2021-42382: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_s function (bsc#1192869).
• CVE-2021-42383: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42384: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the handle_special function (bsc#1192869).
• CVE-2021-42385: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42386: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the nvalloc function (bsc#1192869).

This update for busybox fixes the following issues:

• CVE-2011-5325: Fixed tar directory traversal (bsc#951562).
• CVE-2015-9261: Fixed segfalts and application crashes in huft_build (bsc#1102912).
• CVE-2016-2147: Fixed out of bounds write (heap) due to integer underflow in udhcpc (bsc#970663).
• CVE-2016-2148: Fixed heap-based buffer overflow in OPTION_6RD parsing (bsc#970662).
• CVE-2016-6301: Fixed NTP server denial of service flaw (bsc#991940).
• CVE-2017-15873: Fixed integer overflow in get_next_block function in archival/libarchive/decompress_bunzip2.c (bsc#1064976).
• CVE-2017-15874: Fixed integer underflow in archival/libarchive/decompress_unlzma.c (bsc#1064978).
• CVE-2017-16544: Fixed Insufficient sanitization of filenames when autocompleting (bsc#1069412).
• CVE-2018-1000500 : Fixed missing SSL certificate validation in wget (bsc#1099263).
• CVE-2018-1000517: Fixed heap-based buffer overflow in the retrieve_file_data() (bsc#1099260).
• CVE-2018-20679: Fixed out of bounds read in udhcp (bsc#1121426).
• CVE-2019-5747: Fixed out of bounds read in udhcp components (bsc#1121428).
• CVE-2021-28831: Fixed invalid free or segmentation fault via malformed gzip data (bsc#1184522).
• CVE-2021-42373: Fixed NULL pointer dereference in man leading to DoS when a section name is supplied but no page argument is given (bsc#1192869).
• CVE-2021-42374: Fixed out-of-bounds heap read in unlzma leading to information leak and DoS when crafted LZMA-compressed input is decompressed (bsc#1192869).
• CVE-2021-42375: Fixed incorrect handling of a special element in ash leading to DoS when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters (bsc#1192869).
• CVE-2021-42376: Fixed NULL pointer dereference in hush leading to DoS when processing a crafted shell command (bsc#1192869).
• CVE-2021-42377: Fixed attacker-controlled pointer free in hush leading to DoS and possible code execution when processing a crafted shell command (bsc#1192869).
• CVE-2021-42378: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_i function (bsc#1192869).
• CVE-2021-42379: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the next_input_file function (bsc#1192869).
• CVE-2021-42380: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the clrvar function (bsc#1192869).
• CVE-2021-42381: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the hash_init function (bsc#1192869).
• CVE-2021-42382: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the getvar_s function (bsc#1192869).
• CVE-2021-42383: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42384: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the handle_special function (bsc#1192869).
• CVE-2021-42385: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the evaluate function (bsc#1192869).
• CVE-2021-42386: Fixed use-after-free in awk leading to DoS and possibly code execution when processing a crafted awk pattern in the nvalloc function (bsc#1192869).

This update for busybox fixes the following issues:

• Enable switch_root With this change virtme --force-initramfs works as expected.
• Enable udhcpc

busybox was updated to 1.35.0

• Adjust busybox.config for new features in find, date and cpio

• Annotate CVEs already fixed in upstream, but not mentioned in .changes yet:

• CVE-2017-16544 (bsc#1069412): Insufficient sanitization of filenames when autocompleting
• CVE-2015-9261 (bsc#1102912): huft_build misuses a pointer, causing segfaults
• CVE-2016-2147 (bsc#970663): out of bounds write (heap) due to integer underflow in udhcpc
• CVE-2016-2148 (bsc#970662): heap-based buffer overflow in OPTION_6RD parsing
• CVE-2016-6301 (bsc#991940): NTP server denial of service flaw
• CVE-2017-15873 (bsc#1064976): The get_next_block function in archival/libarchive/decompress_bunzip2.c has an Integer Overflow
• CVE-2017-15874 (bsc#1064978): archival/libarchive/decompress_unlzma.c has an Integer Underflow
• CVE-2019-5747 (bsc#1121428): out of bounds read in udhcp components
• CVE-2021-42373, CVE-2021-42374, CVE-2021-42375, CVE-2021-42376, CVE-2021-42377, CVE-2021-42378, CVE-2021-42379, CVE-2021-42380, CVE-2021-42381, CVE-2021-42382, CVE-2021-42383, CVE-2021-42384, CVE-2021-42385, CVE-2021-42386 (bsc#1192869) : v1.34.0 bugfixes
• CVE-2021-28831 (bsc#1184522): invalid free or segmentation fault via malformed gzip data
• CVE-2018-20679 (bsc#1121426): out of bounds read in udhcp
• CVE-2018-1000517 (bsc#1099260): Heap-based buffer overflow in the retrieve_file_data()
• CVE-2011-5325 (bsc#951562): tar directory traversal
• CVE-2018-1000500 (bsc#1099263): wget: Missing SSL certificate validation

This update for busybox fixes the following issues:

• CVE-2014-9645: Fixed loading of unwanted modules with / (bsc#914660).

• CVE-2017-16544: Fixed insufficient sanitization of filenames when autocompleting (bsc#1069412).

• CVE-2015-9261: Fixed huft_build misuses a pointer, causing segfaults (bsc#1102912).

• CVE-2016-2147: Fixed out of bounds write (heap) due to integer underflow in udhcpc (bsc#970663).

• CVE-2016-2148: Fixed heap-based buffer overflow in OPTION_6RD parsing (bsc#970662).

• CVE-2016-6301: Fixed NTP server denial of service flaw (bsc#991940).

• CVE-2017-15873: Fixed integer overflow in get_next_block function in archival/libarchive/decompress_bunzip2.c (bsc#1064976).

• CVE-2017-15874: Fixed integer overflow in archival/libarchive/decompress_unlzma (bsc#1064978).

• CVE-2019-5747: Fixed out of bounds read in udhcp components (bsc#1121428).

• CVE-2021-42373, CVE-2021-42374, CVE-2021-42375, CVE-2021-42376, CVE-2021-42377, CVE-2021-42378, CVE-2021-42379, CVE-2021-42380, CVE-2021-42381, CVE-2021-42382, CVE-2021-42383, CVE-2021-42384, CVE-2021-42385, CVE-2021-42386: v1.34.0 bugfixes (bsc#1192869).

• CVE-2021-28831: Fixed invalid free or segmentation fault via malformed gzip data (bsc#1184522).

• CVE-2018-20679: Fixed out of bounds read in udhcp (bsc#1121426).

• CVE-2018-1000517: Fixed heap-based buffer overflow in the retrieve_file_data() (bsc#1099260).

• CVE-2011-5325: Fixed tar directory traversal (bsc#951562).

• CVE-2018-1000500: Fixed missing SSL certificate validation in wget (bsc#1099263).

• Update to 1.35.0

  • awk: fix printf %%, fix read beyond end of buffer
  • chrt: silence analyzer warning
  • libarchive: remove duplicate forward declaration
  • mount: 'mount -o rw ....' should not fall back to RO mount
  • ps: fix -o pid=PID,args interpreting entire 'PID,args' as header
  • tar: prevent malicious archives with long name sizes causing OOM
  • udhcpc6: fix udhcp_find_option to actually find DHCP6 options
  • xxd: fix -p -r
  • support for new optoins added to basename, cpio, date, find, mktemp, wget and others

• Enable fdisk (jsc#CAR-16)

• Update to 1.34.1:

  • build system: use SOURCE_DATE_EPOCH for timestamp if available
  • many bug fixes and new features
  • touch: make FEATURE_TOUCH_NODEREF unconditional

• update to 1.33.1:

  • httpd: fix sendfile
  • ash: fix HISTFILE corruptio
  • ash: fix unset variable pattern expansion
  • traceroute: fix option parsing
  • gunzip: fix for archive corruption

• Update to version 1.33.0

  • many bug fixes and new features

• Update to version 1.32.1

  • fixes a case where in ash, 'wait' never finishes.

• prepare usrmerge (bsc#1029961)

• Enable testsuite and package it for later rerun (for QA, jsc#CAR-15)

• Update to version 1.31.1:

  • Bug fix release. 1.30.1 has fixes for dc, ash (PS1 expansion fix), hush, dpkg-deb, telnet and wget.

• Changes from version 1.31.0:

  • many bugfixes and new features.

• Add busybox-no-stime.patch: stime() has been deprecated in glibc 2.31 and replaced with clock_settime().

• update to 1.25.1:

  • fixes for hush, gunzip, ip route, ntpd

• includes changes from 1.25.0:

  • many added and expanded implementations of command options

• includes changes from 1.24.2:

  • fixes for build system (static build with glibc fixed), truncate, gunzip and unzip.

• Update to version 1.24.1

  • for a full list of changes see http://www.busybox.net/news.html

• Refresh busybox.install.patch

• Update to 1.23.2

  • for a full list of changes see http://www.busybox.net/news.html

• Cleaned up spec file with spec-cleaner

• Refreshed patches

• update to 1.22.1: Many updates and fixes for most included tools, see see http://www.busybox.net/news.html