cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from stack memory via vectors related to (1) an invalid subnet in a RPY_SUBNETS_ACCESSED command to the handle_subnets_accessed function or (2) a RPY_CLIENT_ACCESSES command to the handle_client_accesses function when client logging is disabled, which causes uninitialized data to be included in a reply.

The remote NewStart CGSL host, running version MAIN 6.02, has chrony packages installed that are affected by multiple vulnerabilities:

  - Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial     of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to     the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5)     RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which     triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and 1.28 do not require     authentication to exploit. (CVE-2012-4502)

  - cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from     stack memory via vectors related to (1) an invalid subnet in a RPY_SUBNETS_ACCESSED command to the     handle_subnets_accessed function or (2) a RPY_CLIENT_ACCESSES command to the handle_client_accesses     function when client logging is disabled, which causes uninitialized data to be included in a reply.
    (CVE-2012-4503)

  - Chrony before 1.29.1 has traffic amplification in cmdmon protocol (CVE-2014-0021)

  - Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of     service (chronyd crash) or possibly execute arbitrary code by configuring the (1) NTP or (2) cmdmon access     with a subnet size that is indivisible by four and an address with a nonzero bit in the subnet remainder.
    (CVE-2015-1821)

  - chrony before 1.31.1 does not initialize the last next pointer when saving unacknowledged replies to     command requests, which allows remote authenticated users to cause a denial of service (uninitialized     pointer dereference and daemon crash) or possibly execute arbitrary code via a large number of command     requests. (CVE-2015-1822)

  - chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP     associations, which allows remote attackers with knowledge of NTP peering to cause a denial of service     (inability to synchronize) via random timestamps in crafted NTP data packets. (CVE-2015-1853)

  - chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when     authenticating packets, which might allow remote attackers to conduct impersonation attacks via an     arbitrary trusted key, aka a skeleton key. (CVE-2016-1567)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has chrony packages installed that are affected by multiple vulnerabilities:

  - Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial     of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to     the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5)     RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which     triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and 1.28 do not require     authentication to exploit. (CVE-2012-4502)

  - cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive information from     stack memory via vectors related to (1) an invalid subnet in a RPY_SUBNETS_ACCESSED command to the     handle_subnets_accessed function or (2) a RPY_CLIENT_ACCESSES command to the handle_client_accesses     function when client logging is disabled, which causes uninitialized data to be included in a reply.
    (CVE-2012-4503)

  - Chrony before 1.29.1 has traffic amplification in cmdmon protocol (CVE-2014-0021)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has chrony packages installed that are affected by multiple vulnerabilities:

  - Multiple integer overflows in pktlength.c in Chrony     before 1.29 allow remote attackers to cause a denial of     service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED     or (2) REQ_CLIENT_ACCESSES command request to the     PKL_CommandLength function or crafted (3)     RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5)     RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST     command reply to the PKL_ReplyLength function, which     triggers an out-of-bounds read or buffer overflow. NOTE:
    versions 1.27 and 1.28 do not require authentication to     exploit. (CVE-2012-4502)

  - cmdmon.c in Chrony before 1.29 allows remote attackers     to obtain potentially sensitive information from stack     memory via vectors related to (1) an invalid subnet in a     RPY_SUBNETS_ACCESSED command to the     handle_subnets_accessed function or (2) a     RPY_CLIENT_ACCESSES command to the     handle_client_accesses function when client logging is     disabled, which causes uninitialized data to be included     in a reply. (CVE-2012-4503)

  - Chrony before 1.29.1 has traffic amplification in cmdmon     protocol (CVE-2014-0021)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-201402-28 (Chrony: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Chrony. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could possibly cause a Denial of Service condition by       sending specially crafted packets.
  Workaround :

    There is no known workaround at this time.

Florian Weimer discovered two security problems in the Chrony time synchronisation software (buffer overflows and use of uninitialised data in command replies).

This update fixes two security vulnerabilities: a crash when processing crafted commands (CVE-2012-4502) and uninitialized data sent in command replies (CVE-2012-4503).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
154559	NewStart CGSL MAIN 6.02 : chrony Multiple Vulnerabilities (NS-SA-2021-0127)	Nessus	NewStart CGSL Local Security Checks	high
143974	NewStart CGSL CORE 5.05 / MAIN 5.05 : chrony Multiple Vulnerabilities (NS-SA-2020-0112)	Nessus	NewStart CGSL Local Security Checks	high
136904	NewStart CGSL CORE 5.04 / MAIN 5.04 : chrony Multiple Vulnerabilities (NS-SA-2020-0027)	Nessus	NewStart CGSL Local Security Checks	high
72755	GLSA-201402-28 : Chrony: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
69960	Debian DSA-2760-1 : chrony - several vulnerabilities	Nessus	Debian Local Security Checks	medium
69365	Fedora 18 : chrony-1.29-1.fc18 (2013-14539)	Nessus	Fedora Local Security Checks	medium
69302	Fedora 19 : chrony-1.29-1.fc19 (2013-14549)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2012-4503

high

Tenable Plugins

high

high

high

medium

medium

medium

medium