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freebsdFreeBSD0882F019-BD60-11EB-9BDD-8C164567CA3C
HistoryMay 25, 2021 - 12:00 a.m.

NGINX -- 1-byte memory overwrite in resolver

2021-05-2500:00:00
vuxml.freebsd.org
75
nginx
memory overwrite
resolver
arbitrary code execution
dns server
udp packets

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7.7

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS

0.316

Percentile

97.1%

JSON

NGINX team reports:

1-byte memory overwrite might occur during DNS server response
processing if the “resolver” directive was used, allowing an
attacker who is able to forge UDP packets from the DNS server
to cause worker process crash or, potentially, arbitrary code
execution.

OSVersionArchitecturePackageVersionFilename
FreeBSDanynoarchnginx< 1.20.1,2UNKNOWN
FreeBSDanynoarchnginx-devel< 1.21.0UNKNOWN

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CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7.7

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS

0.316

Percentile

97.1%

JSON
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