| Severity | High |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE ID | CVE-2019-15845 CVE-2019-16201 CVE-2019-16254 CVE-2019-16255 |
| CWE ID | CWE-20 CWE-113 CWE-94 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Gentoo Linux Operating systems & Components / Operating system |
| Vendor | Gentoo |
Security Advisory
1) Input validation error
Severity: Medium
CVSSv3:
5.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]
CVE-ID:
CVE-2019-15845
CWE-ID:
CWE-20 – Improper Input Validation
Description
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists in Ruby due to insufficient validation of user-supplied files within File.fnmatch and File.fnmatch? functions when processing NUL byte in the filename. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the system.
Mitigation
Update the affected packages.
dev-lang/ruby to version:
Vulnerable software versions
Gentoo Linux:
–
CPE
External links
https://security.gentoo.org/https://security.gentoo.org/glsa/202003-06
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) Input validation error
Severity: Medium
CVSSv3:
4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]
CVE-ID:
CVE-2019-16201
CWE-ID:
CWE-20 – Improper Input Validation
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the WEBrick::HTTPAuth::DigestAuth in Ruby due to a regular expression issue. A remote attacker can send a specially crafted request to the application and perform a denial of service attack.
Mitigation
Update the affected packages.
dev-lang/ruby to version:
Vulnerable software versions
Gentoo Linux:
–
CPE
External links
https://security.gentoo.org/https://security.gentoo.org/glsa/202003-06
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) Code injection
Severity: High
CVSSv3:
7.1 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]
CVE-ID:
CVE-2019-16255
CWE-ID:
CWE-94 – Improper Control of Generation of Code (‘Code Injection’)
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in lib/shell.rb in Ruby when processing Shell#[] and its alias Shell#test. A remote attacker can send a specially crafted request and execute arbitrary Ruby code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Mitigation
Update the affected packages.
dev-lang/ruby to version:
Vulnerable software versions
Gentoo Linux:
–
CPE
External links
https://security.gentoo.org/https://security.gentoo.org/glsa/202003-06
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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