SB2017112906 - Multiple vulnerabilities in PowerDNS Recursor and Authoritative

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Main Vulnerability Database SB2017112906

SB2017112906 - Multiple vulnerabilities in PowerDNS Recursor and Authoritative

Published: November 29, 2017

Security Bulletin ID SB2017112906
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Man-in-the-middle attack (CVE-ID: CVE-2017-15090)

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to conduct man-in-the-middle attack.

The weakness exists due to improper validation of DNSSEC component of PowerDNS Recursor. A remote attacker can use man-in-the-middle technique, issue a valid signature for the crafted records and alter the content of records.

2) Improper access control (CVE-ID: CVE-2017-15091)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to modify arbitrary data on the target system.

The weakness exists due to insufficient validation of the API component of PowerDNS Authoritative. A remote attacker with valid API credentials can configure the API as read-only via the api-readonly keyword, flush the cache, trigger a zone transfer or send a NOTIFY.

3) Cross-site scripting (CVE-ID: CVE-2017-15092)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


4) File injection (CVE-ID: CVE-2017-15093)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/U:Clear


The vulnerability allows a remote authenticated attacker to inject API file on the target system.

The vulnerability exists in the API of PowerDNS Recursor during a source code audit by Nixu due to insufficient validation of the new netmask and IP addresses of forwarded zones. A remote attacker can add and remove netmasks when api-config-dir is set to a non-empty value and inject new configuration directives into the Recursor’s configuration.


5) Memory leak (CVE-ID: CVE-2017-15094)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


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

The vulnerability exists due to a flaw in the DNSSEC parsing code of PowerDNS Recursor during a code audit by Nixu. A remote attacker can supply specially crafted DNSSEC ECDSA keys, parse it when validation is enabled by setting dnssec to a value other than off or process-no-validate (default), trigger memory leak and cause the service to crash.


Remediation

Install update from vendor's website.

References