CVE-2016-1547

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

These are all security issues fixed in the ntp-4.2.8p9-1.1 package on the GA media of openSUSE Tumbleweed.

This update for ntp to 4.2.8p7 fixes the following issues:

• CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.
• CVE-2016-1548, bsc#977461: Interleave-pivot
• CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack.
• CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks.
• CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability
• CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd.
• CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated.
• CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC.
• CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked.
• This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974

Bugs fixed:

• Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).

This update for ntp to 4.2.8p7 fixes the following issues:

• CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.
• CVE-2016-1548, bsc#977461: Interleave-pivot
• CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack.
• CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks.
• CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability
• CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd.
• CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated.
• CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC.
• CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked.
• This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974

Bugs fixed:

• Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).

This update for ntp fixes the following issues:

• Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.

• Update to 4.2.8p7 (bsc#977446):

  • CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS.
  • CVE-2016-1548, bsc#977461: Interleave-pivot
  • CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack.
  • CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks.
  • CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability
  • CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd.
  • CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated.
  • CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC.
  • CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked.
  • integrate ntp-fork.patch
  • Improve the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974

• Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf (bsc#957226).

ntp was updated to version 4.2.8p8 to fix 17 security issues.

These security issues were fixed:

• CVE-2016-4956: Broadcast interleave (bsc#982068).
• CVE-2016-2518: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC (bsc#977457).
• CVE-2016-2519: ctl_getitem() return value not always checked (bsc#977458).
• CVE-2016-4954: Processing spoofed server packets (bsc#982066).
• CVE-2016-4955: Autokey association reset (bsc#982067).
• CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a 'skeleton key (bsc#962960).
• CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).
• CVE-2016-2516: Duplicate IPs on unconfig directives will cause an assertion botch (bsc#977452).
• CVE-2016-2517: Remote configuration trustedkey/requestkey values are not properly validated (bsc#977455).
• CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).
• CVE-2016-1547: CRYPTO-NAK DoS (bsc#977459).
• CVE-2016-1551: Refclock impersonation vulnerability, AKA: refclock-peering (bsc#977450).
• CVE-2016-1550: Improve NTP security against buffer comparison timing attacks, authdecrypt-timing, AKA: authdecrypt-timing (bsc#977464).
• CVE-2016-1548: Interleave-pivot - MITIGATION ONLY (bsc#977461).
• CVE-2016-1549: Sybil vulnerability: ephemeral association attack, AKA: ntp-sybil - MITIGATION ONLY (bsc#977451).

This release also contained improved patches for CVE-2015-7704, CVE-2015-7705, CVE-2015-7974.

These non-security issues were fixed:

• bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.
• bsc#981422: Don't ignore SIGCHILD because it breaks wait().
• bsc#979981: ntp-wait does not accept fractional seconds, so use 1 instead of 0.2 in ntp-wait.service.
• Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.
• bsc#957226: Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf.

Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker could use this issue to perform a replay attack. (CVE-2015-7973)

Matt Street discovered that NTP incorrectly verified peer associations of symmetric keys. A remote attacker could use this issue to perform an impersonation attack. (CVE-2015-7974)

Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled memory. An attacker could possibly use this issue to cause ntpq to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2015-7975)

Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled dangerous characters in filenames. An attacker could possibly use this issue to overwrite arbitrary files. (CVE-2015-7976)

Stephen Gray discovered that NTP incorrectly handled large restrict lists. An attacker could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7977, CVE-2015-7978)

Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7979)

Jonathan Gardner discovered that NTP incorrectly handled origin timestamp checks. A remote attacker could use this issue to spoof peer servers. (CVE-2015-8138)

Jonathan Gardner discovered that the NTP ntpq utility did not properly handle certain incorrect values. An attacker could possibly use this issue to cause ntpq to hang, resulting in a denial of service. (CVE-2015-8158)

It was discovered that the NTP cronjob incorrectly cleaned up the statistics directory. A local attacker could possibly use this to escalate privileges. (CVE-2016-0727)

Stephen Gray and Matthew Van Gundy discovered that NTP incorrectly validated crypto-NAKs. A remote attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1547)

Miroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly handled switching to interleaved symmetric mode. A remote attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1548)

Matthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that NTP incorrectly handled message authentication. A remote attacker could possibly use this issue to recover the message digest key. (CVE-2016-1550)

Yihan Lian discovered that NTP incorrectly handled duplicate IPs on unconfig directives. An authenticated remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2516)

Yihan Lian discovered that NTP incorrectly handled certail peer associations. A remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2518)

Jakub Prokes discovered that NTP incorrectly handled certain spoofed packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4954)

Miroslav Lichvar discovered that NTP incorrectly handled certain packets when autokey is enabled. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4955)

Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed broadcast packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4956)

In the default installation, attackers would be isolated by the NTP AppArmor profile.