var-201801-0885
Vulnerability from variot
A vulnerability was found in the implementation of DNSSEC in Dnsmasq up to and including 2.78. Wildcard synthesized NSEC records could be improperly interpreted to prove the non-existence of hostnames that actually exist. Dnsmasq Contains an access control vulnerability.Information may be tampered with. Dnsmasq is prone to a security-bypass vulnerability. Attackers can exploit this issue to bypass certain security restrictions to perform unauthorized actions. ========================================================================== Ubuntu Security Notice USN-4924-1 April 22, 2021
dnsmasq vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Dnsmasq.
Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server
Details:
It was discovered that Dnsmasq incorrectly handled certain wildcard synthesized NSEC records. (CVE-2017-15107)
It was discovered that Dnsmasq incorrectly handled certain large DNS packets. A remote attacker could possibly use this issue to cause Dnsmasq to crash, resulting in a denial of service. (CVE-2019-14513)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.10 dnsmasq-base 2.75-1ubuntu0.16.04.10 dnsmasq-utils 2.75-1ubuntu0.16.04.10
After a standard system update you need to reboot your computer to make all the necessary changes.
References: https://ubuntu.com/security/notices/USN-4924-1 CVE-2017-15107, CVE-2019-14513
Package Information: https://launchpad.net/ubuntu/+source/dnsmasq/2.75-1ubuntu0.16.04.10
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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