SB2017062133 - Fedora 26 update for openvpn

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Main Vulnerability Database SB2017062133

SB2017062133 - Fedora 26 update for openvpn

Published: June 21, 2017 Updated: April 24, 2025

Security Bulletin ID SB2017062133
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 25% Medium 25% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Improper input validation (CVE-ID: CVE-2017-7508)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due assertion failure when processing IPv6 packets. A remote attacker can send a specially crafted IPv6 packet and perform a denial of service (DoS) attack.


2) MitM attack (CVE-ID: CVE-2017-7520)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack or obtain potentially sensitive client's information.

If clients use a HTTP proxy with NTLM authentication (i.e. "--http-proxy <server> <port> [<authfile>|'auto'|'auto-nct'] ntlm2"), a man-in-the-middle attacker between the client and the proxy can cause the client to crash or disclose at most 96 bytes of stack memory. The disclosed stack memory is likely to contain the proxy password.


3) Double free error (CVE-ID: CVE-2017-7521)

CWE-ID: CWE-415 - Double Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to double free error when processing --x509-alt-username attribute. A remote unauthenticated attacker can trigger double free error and crash the affected server or potentially execute arbitrary code.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


4) Improper input validation (CVE-ID: CVE-2017-7522)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when processing --x509-track attribute within mbedtls. A remote authenticated attacker can perform denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References