openEuler 20.03 LTS update for unbound-1.7.3-14



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-12662
CVE-2020-12663
CWE-ID CWE-20
CWE-835
Exploitation vector Network
Public exploit N/A
Vulnerable software
 openEuler
Operating systems & Components / Operating system

unbound-libs
Operating systems & Components / Operating system package or component

unbound-help
Operating systems & Components / Operating system package or component

unbound-devel
Operating systems & Components / Operating system package or component

unbound-debugsource
Operating systems & Components / Operating system package or component

unbound-debuginfo
Operating systems & Components / Operating system package or component

python3-unbound
Operating systems & Components / Operating system package or component

unbound
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU28161

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12662

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing DNS responses. A remote attacker who controls a malicious DNS server can send a specially crafted response and perform a denial of service (DoS) attack against third-party DNS servers.

The attack is triggered by random subdomains in the NSDNAME in NS records.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

unbound-libs: before 1.7.3-15

unbound-help: before 1.7.3-15

unbound-devel: before 1.7.3-15

unbound-debugsource: before 1.7.3-15

unbound-debuginfo: before 1.7.3-15

python3-unbound: before 1.7.3-15

unbound: before 1.7.3-15

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2020-1055


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Infinite loop

EUVDB-ID: #VU28163

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12663

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop when parsing DNS responses. A remote attacker can send a specially crafted DNS response to the server, consume all available system resources and cause denial of service conditions.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

unbound-libs: before 1.7.3-15

unbound-help: before 1.7.3-15

unbound-devel: before 1.7.3-15

unbound-debugsource: before 1.7.3-15

unbound-debuginfo: before 1.7.3-15

python3-unbound: before 1.7.3-15

unbound: before 1.7.3-15

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2020-1055


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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