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GLSA
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Joined: 12 May 2004
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PostPosted: Thu May 27, 2021 8:26 pm    Post subject: [ GLSA 202105-38 ] nginx Reply with quote

Gentoo Linux Security Advisory

Title: nginx: Remote code execution (GLSA 202105-38)
Severity: high
Exploitable: remote
Date: 2021-05-26
Bug(s): #792087
ID: 202105-38

Synopsis

A vulnerability in nginx could lead to remote code execution.

Background

nginx is a robust, small, and high performance HTTP and reverse proxy
server.


Affected Packages

Package: www-servers/nginx
Vulnerable: < 1.21.0
Unaffected: >= 1.20.1
Unaffected: >= 1.21.0
Architectures: All supported architectures


Description

It was discovered that nginx did not properly handle DNS responses when
“resolver” directive is used.


Impact

A remote attacker, able to provide DNS responses to a nginx instance,
could cause the execution of arbitrary code with the privileges of the
process or a Denial of Service condition.


Workaround

There is no known workaround at this time.

Resolution

All nginx users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=www-servers/nginx-1.20.1"
   
All nginx mainline users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose
      ">=www-servers/nginx-1.21.0:mainline"
   


References

CVE-2021-23017
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