certfr_avis - certfr-2021-avi-410

CERTFR-2021-AVI-410

Vulnerability from certfr_avis - Published: - Updated:

Une vulnérabilité a été découverte dans ISC DHCP. Elle permet à un attaquant de provoquer un déni de service à distance.

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

ISC DHCP versions 4.1-ESV-Rx antérieures à 4.1-ESV-R16-P1
ISC DHCP versions 4.4.x antérieures à 4.4.2-P1

L'éditeur ne maintient plus les versions 4.0.x et antérieures ainsi que les versions 4.3.x. Les utilisateurs d'une version obsolète doivent préalablement mettre à jour le composant Bind pour bénéficier des correctifs de sécurité.

Impacted products

	Vendor	Product	Description

References

Title

Publication Time

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

Vulnerability from cvelistv5 – Published: 2021-05-26 22:10 – Updated: 2024-09-16 22:08

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

URL

Tags

	https://kb.isc.org/docs/cve-2021-25217
	http://www.openwall.com/lists/oss-security/2021/05/26/6	mailing-list
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2021…	mailing-list
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://cert-portal.siemens.com/productcert/pdf/s…
	https://security.netapp.com/advisory/ntap-2022032…
	https://cert-portal.siemens.com/productcert/pdf/s…
	https://security.gentoo.org/glsa/202305-22	vendor-advisory

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)

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

JSON

To clipboard

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Sightings

Author	Source	Type	Date

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.

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