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redosRedosROS-2-1251
HistoryDec 24, 2021 - 12:00 a.m.

ROS-2-1251

2021-12-2400:00:00
redos.red-soft.ru
6
remote code execution
nginx vulnerability
security updates

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

AI Score

8.4

Confidence

Low

EPSS

0.316

Percentile

97.1%

2.1251 Remote code execution in nginx(CVE-2021-23017)

1. Vulnerability Description:

The vulnerability allows a remote attacker to execute arbitrary code on the target system. The vulnerability exists due to a single error in the ngx_resolver_copy()function when processing DNS responses. A remote attacker could cause a non-unique error, write the dot character (‘.’, 0x2E) out of bounds in the allocated heap buffer, and execute arbitrary code on the system. Successful exploitation of this vulnerability could lead to a complete compromise of the vulnerable system.Identifier of the Information Security Threats Data Bank of the FSTEC of Russia: BDU:2021-02749

2. Possible measures to eliminate the vulnerability

Do not use nginx server or - install security updates for package: nginx**Installing updates is possible in the following ways:**a) if the computer with the installed OS version has access to the vendor’s official repository, run the update as administrator with the command:# yum updateAfter the list of updated packages is displayed, agree to apply the updates by pressing the Y key on the keyboard. Wait until the update installation is complete and make sure that there are no errors during its installation.b)If the computer with the installed OS version does not have access to the vendor’s official repository, you should perform the following actions: - download the updated package (with dependencies if necessary): http://repo.red-soft.ru/redos/7.2c/x86_64/updates/nginx-1.14.1-4.el7.x86_64.rpm Check the integrity and authenticity of the package according to instructionsInstall the downloaded package(s) with the command:# yum localinstall *.rpmWhen the list of updated packages is displayed, agree to apply the updates by pressingY on the keyboard. Wait for the updates to finish installing and make sure there are no errors during the installation.

Date of last modification: 08.09.2021

OSVersionArchitecturePackageVersionFilename
redosunknown< UNKNOWN

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

AI Score

8.4

Confidence

Low

EPSS

0.316

Percentile

97.1%