CVE-2021-25217 (GCVE-0-2021-25217)

Vulnerability from cvelistv5 – Published: 2021-05-26 22:10 – Updated: 2024-09-16 22:08
VLAI?
Title
A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient
Summary
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.
Severity ?
7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
  • Program code used by the ISC DHCP package to read and parse stored leases has a defect that can be exploited by an attacker to cause one of several undesirable outcomes, depending on the component attacked and the way in which it was compiled. Because of a discrepancy between the code which handles encapsulated option information in leases transmitted "on the wire" and the code which reads and parses lease information after it has been written to disk storage, it is potentially possible for an attacker to deliberately cause a situation where: dhcpd, while running in DHCPv4 or DHCPv6 mode, or dhclient, the ISC DHCP client implementation will attempt to read a stored lease that contains option information which will trigger a bug in the option parsing code. Affects 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. Affects both dhcpd (server) and dhcpcd (client).
Assigner
isc
References
Impacted products
Vendor Product Version
ISC ISC DHCP Affected: 4.1 ESV , < 4.1-ESV-R16-P1 (custom)
Affected: 4.4 , < 4.4.2-P1 (custom)
Create a notification for this product.
Date Public ?
2021-05-26 00:00
Credits
ISC would like to thank Jon Franklin from Dell and Pawel Wieczorkiewicz from Amazon Web Services for (independently) reporting this vulnerability.
Show details on NVD website
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 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.\"}, {\"lang\": \"es\", \"value\": \"En ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16, ISC DHCP versiones 4.4.0 anteriores a 4.4.2 (Otras ramas de ISC DHCP (es decir, versiones de la serie 4.0.x o inferiores y versiones de la serie 4.3.x) est\\u00e1n m\\u00e1s all\\u00e1 de su End-of-Life (EOL) y ya no son soportadas por ISC. El resultado de encontrar el fallo mientras se lee un contrato de arrendamiento que lo desencadena var\\u00eda, seg\\u00fan: el componente afectado (es decir, dhclient o dhcpd) si el paquete se construy\\u00f3 como un binario de 32 o 64 bits si fue usado el flag del compilador -fstack-protection-strong al compilar En dhclient, ISC no ha reproducido con \\u00e9xito el error en un sistema de 64 bits. Sin embargo, en un sistema de 32 bits es posible causar a dhclient bloquearse cuando leen un contrato de arrendamiento inapropiado, lo que podr\\u00eda causar problemas de conectividad de red para un sistema afectado debido a la ausencia de un proceso de cliente DHCP en ejecuci\\u00f3n. En dhcpd, cuando se ejecuta en modo DHCPv4 o DHCPv6: si el binario del servidor dhcpd fue construido para una arquitectura de 32 bits Y se especific\\u00f3 el flag -fstack-protection-strong al compilador, dhcpd puede salir mientras analiza un archivo de arrendamiento que contiene un arrendamiento objetable, resultando en la falta de servicio a los clientes. Si el binario del servidor dhcpd fue construido para una arquitectura de 64 bits O si la flag -fstack-protection-strong del compilador NO fue especificado, el bloqueo no ocurrir\\u00e1, pero es posible que el contrato de arrendamiento ofensivo y el que le sigue sean borrados inapropiadamente\"}]",
      "id": "CVE-2021-25217",
      "lastModified": "2024-11-21T05:54:34.013",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"security-officer@isc.org\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"baseScore\": 7.4, \"baseSeverity\": \"HIGH\", \"attackVector\": \"ADJACENT_NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 4.0}, {\"source\": \"nvd@nist.gov\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"baseScore\": 7.4, \"baseSeverity\": \"HIGH\", \"attackVector\": \"ADJACENT_NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 4.0}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:A/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 3.3, \"accessVector\": \"ADJACENT_NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"LOW\", \"exploitabilityScore\": 6.5, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-05-26T22:15:07.947",
      "references": "[{\"url\": \"http://www.openwall.com/lists/oss-security/2021/05/26/6\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Mailing List\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://kb.isc.org/docs/cve-2021-25217\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Exploit\", \"Vendor Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/\", \"source\": \"security-officer@isc.org\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/\", \"source\": \"security-officer@isc.org\"}, {\"url\": \"https://security.gentoo.org/glsa/202305-22\", \"source\": \"security-officer@isc.org\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20220325-0011/\", \"source\": \"security-officer@isc.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/05/26/6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://kb.isc.org/docs/cve-2021-25217\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Vendor Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.gentoo.org/glsa/202305-22\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20220325-0011/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}]",
      "sourceIdentifier": "security-officer@isc.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-119\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-25217\",\"sourceIdentifier\":\"security-officer@isc.org\",\"published\":\"2021-05-26T22:15:07.947\",\"lastModified\":\"2024-11-21T05:54:34.013\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In ISC DHCP 4.1-ESV-R1 -\u003e 4.1-ESV-R16, ISC DHCP 4.4.0 -\u003e 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.\"},{\"lang\":\"es\",\"value\":\"En ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16, ISC DHCP versiones 4.4.0 anteriores a 4.4.2 (Otras ramas de ISC DHCP (es decir, versiones de la serie 4.0.x o inferiores y versiones de la serie 4.3.x) est\u00e1n m\u00e1s all\u00e1 de su End-of-Life (EOL) y ya no son soportadas por ISC. El resultado de encontrar el fallo mientras se lee un contrato de arrendamiento que lo desencadena var\u00eda, seg\u00fan: el componente afectado (es decir, dhclient o dhcpd) si el paquete se construy\u00f3 como un binario de 32 o 64 bits si fue usado el flag del compilador -fstack-protection-strong al compilar En dhclient, ISC no ha reproducido con \u00e9xito el error en un sistema de 64 bits. Sin embargo, en un sistema de 32 bits es posible causar a dhclient bloquearse cuando leen un contrato de arrendamiento inapropiado, lo que podr\u00eda causar problemas de conectividad de red para un sistema afectado debido a la ausencia de un proceso de cliente DHCP en ejecuci\u00f3n. En dhcpd, cuando se ejecuta en modo DHCPv4 o DHCPv6: si el binario del servidor dhcpd fue construido para una arquitectura de 32 bits Y se especific\u00f3 el flag -fstack-protection-strong al compilador, dhcpd puede salir mientras analiza un archivo de arrendamiento que contiene un arrendamiento objetable, resultando en la falta de servicio a los clientes. Si el binario del servidor dhcpd fue construido para una arquitectura de 64 bits O si la flag -fstack-protection-strong del compilador NO fue especificado, el bloqueo no ocurrir\u00e1, pero es posible que el contrato de arrendamiento ofensivo y el que le sigue sean borrados 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  }
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.