Security Advisory

1) Security restrictions bypass

Severity: Low

CVSSv3:
5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2018-16396

CWE-ID:
CWE-20 – Improper Input Validation

Exploit availability:
No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to the tainted flags are not propagated with the BbH, and h directives. A remote attacker can supply inputs by Array#pack and/or String#unpack with these directives and checks the reliability with tainted flags and cause the check to be wrong to bypass security restrictions and conduct further attacks.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cross-site scripting

Severity: Low

CVSSv3:
3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID:
CVE-2019-8321

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 in Gem::UserInteraction#verbose. 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

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Cross-site scripting

Severity: Low

CVSSv3:
3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID:
CVE-2019-8322

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 when displaying contents of the API response directly to stdout. 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

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Cross-site scripting

Severity: Low

CVSSv3:
3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID:
CVE-2019-8323

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 in Gem::GemcutterUtilities#with_response when displaying data in the API. 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

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Code Injection

Severity: Medium

CVSSv3:
6.5 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2019-8324

CWE-ID:
CWE-94 – Improper Control of Generation of Code (‘Code Injection’)

Exploit availability:
No

Description


The vulnerability allows a remote attacker to execute arbitrary code on the target system.


The vulnerability exists due to improper input validation when processing multiple line entries within gems in ensure_loadable_spec(). A remote attacker can send a specially crafted gem, inject malicious code into stub line of gemspec and execute it code on the target system.


Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Cross-site scripting

Severity: Low

CVSSv3:
3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID:
CVE-2019-8325

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

Exploit availability:
No

Description


The vulnerability allows a remote attacker to perform XSS attacks.


The vulnerability exists due to improper input validation when processing alerts in the Gem::CommandManager#run. A remote attacker can inject and execute arbitrary HTML or JavaScript code.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

ruby (Red Hat package):
2.0.0.648-33.el7_4, 2.0.0.648-34.el7_4, 2.0.0.648-35.el7_4, 2.0.0.648-36.el7_4

Red Hat Enterprise Linux Server – TUS:
7.4

CPE

External links

https://access.redhat.com/errata/RHSA-2020:2769

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.





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