cve-2021-25217
Vulnerability from cvelistv5
Published
2021-05-26 22:10
Modified
2024-09-16 22:08
Summary
A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient
Impacted products
ISCISC DHCP
Show details on NVD website


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            "url": "https://kb.isc.org/docs/cve-2021-25217"
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      "credits": [
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          "lang": "en",
          "value": "ISC would like to thank Jon Franklin from Dell and Pawel Wieczorkiewicz from Amazon Web Services for (independently) reporting this vulnerability."
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          "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."
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          "value": "Upgrade to the patched release most closely related to your current version of ISC DHCP:\n\n    ISC DHCP 4.1-ESV-R16-P1\n    ISC DHCP 4.4.2-P1"
        }
      ],
      "source": {
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      "title": "A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient",
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    "dateReserved": "2021-01-15T00:00:00",
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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\"]}]}}"
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.