CVSS: 6.5EPSS: 0%CPEs: 34EXPL: 0CVE-2022-2928 – An option refcount overflow exists in dhcpd
https://notcve.org/view.php?id=CVE-2022-2928
In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort. En ISC DHCP versiones 4.4.0 anteriores a 4.4.3, ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16-P1, cuando la función option_code_hash_lookup() es llamada desde add_option(), incrementa el campo refcount de la opción. • https://kb.isc.org/docs/cve-2022-2928 https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX https://security.gentoo.org/glsa/202305-22 https:/&#x • CWE-190: Integer Overflow or Wraparound CWE-476: NULL Pointer Dereference •
CVSS: 6.5EPSS: 0%CPEs: 35EXPL: 0CVE-2022-2929 – DHCP memory leak
https://notcve.org/view.php?id=CVE-2022-2929
In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory. En ISC DHCP versiones 1.0 anteriores a 4.4.3, ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16-P1, un sistema con acceso a un servidor DHCP, enviando paquetes DHCP diseñados para incluir etiquetas fqdn de más de 63 bytes, podría llegar a causar a el servidor quedarse sin memoria A vulnerability was found in the DHCP server where the "fqdn_universe_decode()" function allocates buffer space for the contents of option 81 (fqdn) data received in a DHCP packet. The maximum length of a DNS "label" is 63 bytes. The function tests the length byte of each label contained in the "fqdn"; if it finds a label whose length byte value is larger than 63, it returns without dereferencing the buffer space. This issue causes a memory leak. • https://kb.isc.org/docs/cve-2022-2929 https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX https://security.gentoo.org/glsa/202305-22 https:/&#x • CWE-770: Allocation of Resources Without Limits or Throttling •
CVSS: 8.8EPSS: 0%CPEs: 57EXPL: 1CVE-2021-25217 – A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient
https://notcve.org/view.php?id=CVE-2021-25217
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted. • http://www.openwall.com/lists/oss-security/2021/05/26/6 https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf https://kb.isc.org/docs/cve-2021-25217 https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/ • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 7.5EPSS: 0%CPEs: 38EXPL: 0CVE-2018-5732 – A specially constructed response from a malicious server can cause a buffer overflow in dhclient
https://notcve.org/view.php?id=CVE-2018-5732
Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0 Un fallo al comprobar apropiadamente los límites de un búfer usado para procesar las opciones de DHCP, permite a un servidor malicioso (o a una entidad que se hace pasar por un servidor) causar un desbordamiento del búfer (y el bloqueo resultante) en dhclient mediante el envío de una respuesta que contiene una sección de opciones especialmente construida. Afecta a ISC DHCP versiones 4.1.0 hasta 4.1-ESV-R15, 4.2.0 hasta 4.2.8, 4.3.0 hasta 4.3.6, y 4.4.0. An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet. • https://kb.isc.org/docs/aa-01565 https://access.redhat.com/security/cve/CVE-2018-5732 https://bugzilla.redhat.com/show_bug.cgi?id=1549960 • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 7.5EPSS: 7%CPEs: 55EXPL: 0CVE-2018-5733 – A malicious client can overflow a reference counter in ISC dhcpd
https://notcve.org/view.php?id=CVE-2018-5733
A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0. Un cliente malicioso al que se le permite enviar grandes cantidades de tráfico (miles de millones de paquetes) a un servidor DHCP puede terminar desbordando un contador de referencia de 32 bits, provocando el cierre inesperado de dhcpd. Afecta a ISC DHCP desde la versión 4.1.0 hasta la 4.1-ESV-R15, desde la versión 4.2.0 hasta la 4.2.8, desde la versión 4.3.0 hasta la 4.3.6 y a la versión 4.4.0. A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. • http://www.securityfocus.com/bid/103188 http://www.securitytracker.com/id/1040437 https://access.redhat.com/errata/RHSA-2018:0469 https://access.redhat.com/errata/RHSA-2018:0483 https://kb.isc.org/docs/aa-01567 https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html https://usn.ubuntu.com/3586-1 https://usn.ubuntu.com/3586-2 https://www.debian.org/security/2018/dsa-4133 https://access.redhat.com/security/cve/CVE-2018-5733 https://bugzilla.redhat • CWE-190: Integer Overflow or Wraparound •