Multiple vulnerabilities in Go



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-14039
CVE-2020-15586
CWE-ID CWE-295
CWE-362
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Go programming language
Universal components / Libraries / Scripting languages

Vendor Google

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Certificate Validation

EUVDB-ID: #VU31890

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-14039

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists when "VerifyOptions.Roots" is nil, "Certificate.Verify" does not check the EKU requirements specified in "VerifyOptions.KeyUsages".

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.13 - 1.14.4

CPE2.3 External links

https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
https://groups.google.com/forum/#!forum/golang-announce
https://groups.google.com/forum/#!topic/golang-announce/XZNfaiwgt2w


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) Race condition

EUVDB-ID: #VU31891

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-15586

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in some net/http servers, as demonstrated by the httputil.ReverseProxy Handler. A remote attacker can exploit the race and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.13 - 1.14.4

CPE2.3 External links

https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
https://groups.google.com/forum/#!topic/golang-announce/f2c5bqrGH_g
https://groups.google.com/forum/#!topic/golang-announce/XZNfaiwgt2w
https://www.cloudfoundry.org/blog/cve-2020-15586/


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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