Arch Linux update for go
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-34558 |
| CWE-ID | CWE-295 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software |
Arch Linux Operating systems & Components / Operating system go Operating systems & Components / Operating system package or component |
| Vendor | Arch Linux |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improper Certificate Validation
EUVDB-ID: #VU55665
Risk: Medium
CVSSv4.0: 7.7 [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:P/U:Green]
CVE-ID: CVE-2021-34558
CWE-ID:
CWE-295 - Improper Certificate Validation
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper certificate verification in crypto/tls package in Go when processing X.509 certificates. The application does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.
MitigationUpdate the affected package go to version 2
Vulnerable software versionsArch Linux: All versions
go: before 2
CPE2.3 External linkshttps://security.archlinux.org/advisory/ASA-202107-42
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. However, proof of concept for this vulnerability is available.
