CVE-2021-25217

high
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Description

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.

References

https://kb.isc.org/docs/cve-2021-25217

http://www.openwall.com/lists/oss-security/2021/05/26/6

https://lists.fedoraproject.org/archives/list/[email protected]/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/

https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/

Details

Source: MITRE

Published: 2021-05-26

Updated: 2021-06-09

Type: CWE-119

Risk Information

CVSS v2

Base Score: 3.3

Vector: AV:A/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 6.5

Severity: LOW

CVSS v3

Base Score: 7.4

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Impact Score: 4

Exploitability Score: 2.8

Severity: HIGH

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r10_rc1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r10b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r10rc1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc2:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11rc1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r11rc2:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r12-p1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r12_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r12_p1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r12b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r13:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r13_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r13b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r14:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r14_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r14b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r15:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r15-p1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r15_b1:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:4.1-esv:r16:*:*:*:*:*:*

cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:* versions from 4.4.0 to 4.4.2 (inclusive)

Configuration 2

OR

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

Configuration 3

OR

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Tenable Plugins

View all (44 total)

IDNameProductFamilySeverity
154575NewStart CGSL CORE 5.04 / MAIN 5.04 : dhcp Vulnerability (NS-SA-2021-0111)NessusNewStart CGSL Local Security Checks
high
154407EulerOS 2.0 SP3 : dhcp (EulerOS-SA-2021-2578)NessusHuawei Local Security Checks
high
153295EulerOS 2.0 SP2 : dhcp (EulerOS-SA-2021-2365)NessusHuawei Local Security Checks
high
153048EulerOS 2.0 SP5 : dhcp (EulerOS-SA-2021-2326)NessusHuawei Local Security Checks
high
152310EulerOS 2.0 SP9 : dhcp (EulerOS-SA-2021-2267)NessusHuawei Local Security Checks
high
152295EulerOS 2.0 SP9 : dhcp (EulerOS-SA-2021-2241)NessusHuawei Local Security Checks
high
152282EulerOS 2.0 SP8 : dhcp (EulerOS-SA-2021-2291)NessusHuawei Local Security Checks
high
151721openSUSE 15 Security Update : dhcp (openSUSE-SU-2021:1841-1)NessusSuSE Local Security Checks
high
151566EulerOS Virtualization 2.9.0 : dhcp (EulerOS-SA-2021-2205)NessusHuawei Local Security Checks
high
151558EulerOS Virtualization 2.9.1 : dhcp (EulerOS-SA-2021-2188)NessusHuawei Local Security Checks
high
151509Amazon Linux AMI : dhcp (ALAS-2021-1510)NessusAmazon Linux Local Security Checks
high
151426RHEL 7 / 8 : OpenShift Container Platform 4.7.19 packages and (RHSA-2021:2555)NessusRed Hat Local Security Checks
high
151348EulerOS Virtualization for ARM 64 3.0.2.0 : dhcp (EulerOS-SA-2021-2077)NessusHuawei Local Security Checks
high
150970Amazon Linux 2 : dhcp (ALAS-2021-1654)NessusAmazon Linux Local Security Checks
high
150951RHEL 7 : RHV-H security update (redhat-virtualization-host) 4.3.16 (Important) (RHSA-2021:2519)NessusRed Hat Local Security Checks
high
150906OracleVM 3.4 : dhcp (OVMSA-2021-0018)NessusOracleVM Local Security Checks
high
150853RHEL 7 : dhcp (RHSA-2021:2469)NessusRed Hat Local Security Checks
high
150843Oracle Linux 6 : dhcp (ELSA-2021-9314)NessusOracle Linux Local Security Checks
high
150826RHEL 8 : dhcp (RHSA-2021:2359)NessusRed Hat Local Security Checks
high
150822RHEL 8 : dhcp (RHSA-2021:2416)NessusRed Hat Local Security Checks
high
150814RHEL 7 : dhcp (RHSA-2021:2418)NessusRed Hat Local Security Checks
high
150781RHEL 7 : dhcp (RHSA-2021:2415)NessusRed Hat Local Security Checks
high
150780RHEL 8 : dhcp (RHSA-2021:2420)NessusRed Hat Local Security Checks
high
150776RHEL 7 : dhcp (RHSA-2021:2414)NessusRed Hat Local Security Checks
high
150766RHEL 7 : dhcp (RHSA-2021:2405)NessusRed Hat Local Security Checks
high
150763CentOS 7 : dhcp (CESA-2021:2357)NessusCentOS Local Security Checks
high
150760Scientific Linux Security Update : dhcp on SL7.x i686/x86_64 (2021:2357)NessusScientific Linux Local Security Checks
high
150570SUSE SLES11 Security Update : dhcp (SUSE-SU-2021:14740-1)NessusSuSE Local Security Checks
high
150498Oracle Linux 8 : dhcp (ELSA-2021-2359)NessusOracle Linux Local Security Checks
high
150497Oracle Linux 7 : dhcp (ELSA-2021-2357)NessusOracle Linux Local Security Checks
high
150432RHEL 7 : dhcp (RHSA-2021:2357)NessusRed Hat Local Security Checks
high
150255Debian DLA-2674-1 : isc-dhcp security updateNessusDebian Local Security Checks
high
150251openSUSE Security Update : dhcp (openSUSE-2021-834)NessusSuSE Local Security Checks
high
150218FreeBSD : isc-dhcp -- remotely exploitable vulnerability (e24fb8f8-c39a-11eb-9370-b42e99a1b9c3)NessusFreeBSD Local Security Checks
high
150201SUSE SLES12 Security Update : dhcp (SUSE-SU-2021:1822-1)NessusSuSE Local Security Checks
high
150191SUSE SLED15 / SLES15 Security Update : dhcp (SUSE-SU-2021:1841-1)NessusSuSE Local Security Checks
high
150096Slackware 14.0 / 14.1 / 14.2 / current : dhcp (SSA:2021-149-01)NessusSlackware Local Security Checks
high
150070Photon OS 2.0: Dhcp PHSA-2021-2.0-0349NessusPhotonOS Local Security Checks
high
150067Photon OS 3.0: Dhcp PHSA-2021-3.0-0244NessusPhotonOS Local Security Checks
high
150066Photon OS 4.0: Dhcp PHSA-2021-4.0-0034NessusPhotonOS Local Security Checks
high
150053ISC DHCP < 4.4.2-P1 DoSNessusMisc.
high
150046Photon OS 1.0: Dhcp PHSA-2021-1.0-0394NessusPhotonOS Local Security Checks
high
150030Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : DHCP vulnerability (USN-4969-1)NessusUbuntu Local Security Checks
high
150028Ubuntu 16.04 LTS : DHCP vulnerability (USN-4969-2)NessusUbuntu Local Security Checks
high