Fedora 28 update for pdns-recursor



| Updated: 2025-04-24
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2018-16855
CVE-2018-10851
CVE-2018-14626
CVE-2018-14644
CWE-ID CWE-125
CWE-401
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

pdns-recursor
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Out-of-bounds read

EUVDB-ID: #VU16147

Risk: Low

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:Clear]

CVE-ID: CVE-2018-16855

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to out-of-bounds memory read while computing the hash of the query for a packet cache lookup. A remote attacker can send a specially crafted DNS query and cause the service to crash.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 28

pdns-recursor: before 4.1.8-1.fc28

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c341b70641


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) Memory leak

EUVDB-ID: #VU15960

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-10851

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to memory leak when handling malicious input. A remote attacker can insert a specially crafted record in a zone under his control, send a DNS query for that record, trigger memory leak and cause the service to crash.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 28

pdns-recursor: before 4.1.8-1.fc28

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c341b70641


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

3) Improper input validation

EUVDB-ID: #VU15961

Risk: Low

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:Clear]

CVE-ID: CVE-2018-14626

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to DNSSEC validating clients consider the answer to be bogus until it expires from the packet cache. A remote attacker can craft a DNS query, cause an answer without DNSSEC records to be inserted into the packet cache and be returned to clients asking for DNSSEC records, thus hiding the presence of DNSSEC signatures for a specific qname and qtype.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 28

pdns-recursor: before 4.1.8-1.fc28

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c341b70641


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.

4) Improper input validation

EUVDB-ID: #VU15962

Risk: Low

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:Clear]

CVE-ID: CVE-2018-14644

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. A remote attacker can send a DNS query for a meta-type like OPT, lead to a zone being wrongly cached as failing DNSSEC validation and cause subsequent queries from clients to request DNSSEC validation answered with a ServFail.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 28

pdns-recursor: before 4.1.8-1.fc28

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c341b70641


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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