Gentoo: GLSA-202105-20 Low: Dnsmasq DNS Cache Poisoning
gentoo
May 26, 2021
Use of insufficient randomness in Dnsmasq might lead to DNS Cache Poisoning.
Summary
It was discovered that Dnsmasq, when configured with --server=
@
Resolution
All Dnsmasq users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.85"
References
[ 1 ] CVE-2021-3448 https://nvd.nist.gov/vuln/detail/CVE-2021-3448
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202105-20
style>.gentoo_availability{display:block;}
Concerns
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
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Severity: Low
Title: Dnsmasq: DNS cache poisoning
Date: May 26, 2021
Bugs: #782130
ID: 202105-20
Background
Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP
server.
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Affected Packages
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/dnsmasq < 2.85 >= 2.85
Impact
=====
An attacker, by sending malicious crafted DNS responses, could perform
a DNS Cache Poisoning attack.
Workaround
There is no known workaround at this time.
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