Red Hat Enterprise Linux 8 update for the httpd:2.4 module



Published: 2020-11-04
Risk Medium
Patch available YES
Number of vulnerabilities 10
CVE-ID CVE-2018-17189
CVE-2019-0196
CVE-2019-0197
CVE-2019-10081
CVE-2019-10082
CVE-2019-10092
CVE-2019-10097
CVE-2019-10098
CVE-2020-1927
CVE-2020-1934
CWE-ID CWE-20
CWE-416
CWE-399
CWE-787
CWE-79
CWE-476
CWE-601
CWE-457
Exploitation vector Network
Public exploit Public exploit code for vulnerability #8 is available.
Vulnerable software
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Red Hat Enterprise Linux for ARM 64
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power, little endian
Operating systems & Components / Operating system

Red Hat Enterprise Linux for IBM z Systems
Operating systems & Components / Operating system

Red Hat Enterprise Linux for x86_64
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 10 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU17177

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2018-17189

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to an error when handling malicious input. A remote attacker can send a specially crafted request bodies in a slow loris way to plain resources and cause the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Use-after-free

EUVDB-ID: #VU18109

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-0196

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the mod_http2 module when processing HTTP/2 requests. A remote attacker can make the application to access freed memory during string comparison when determining the method of a request and process the request incorrectly.

Successful exploitation of the vulnerability may allow an attacker to gain access to sensitive information or perform a denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Resource management error

EUVDB-ID: #VU18108

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-0197

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to an error within the mod_http2 module when processing update requests from http/1.1 to http/2, if this was not the first request on a connection. A remote attacker can send specially crafted requests to the affected server and perform denial of service attack.

Successful exploitation of the vulnerability requires that HTTP/2 protocol is enabled for a "http:" host or H2Upgrade is enabled for h2 on a "https:" host.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

4) Out-of-bounds write

EUVDB-ID: #VU20373

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-10081

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing HTTP/2 requests within the mod_http2 module, configured with "H2PushResource". A remote attacker can send specially crafted HTTP/2 requests to the affected server and perform denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

5) Use-after-free

EUVDB-ID: #VU20386

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-10082

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the mod_http2 when handling connection shutdown. A remote attacker can send specially crafted requests to the affected server and make the mod_http2 to read memory that was already freed.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

6) Cross-site scripting

EUVDB-ID: #VU20384

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2019-10092

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data on the mod_proxy error page. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

7) NULL pointer dereference

EUVDB-ID: #VU20385

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2019-10097

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error when processing PROXY header within the mod_remoteip. A remote attacker that controls a trusted proxy server can send a specially crafted PROXY header,  trigger stack overflow and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

8) Input validation error

EUVDB-ID: #VU20374

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2019-10098

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect handling of encoded line break characters  within rewrite rules. A remote attacker can send a specially crafted HTTP request and potentially bypass security restrictions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

9) Open redirect

EUVDB-ID: #VU26527

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-1927

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in some "mod_rewrite" configurations. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

10) Use of Uninitialized Variable

EUVDB-ID: #VU26528

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-1934

CWE-ID: CWE-457 - Use of Uninitialized Variable

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to the "mod_proxy_ftp" may use uninitialized memory when proxying to a malicious FTP server. A remote attacker can gain unauthorized access to sensitive information on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for ARM 64: 8

Red Hat Enterprise Linux for Power, little endian: 8

Red Hat Enterprise Linux for IBM z Systems: 8

Red Hat Enterprise Linux for x86_64: 8.0


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2020:4751

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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