openEuler update for gnutls



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-20231
CVE-2021-20232
CWE-ID CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
 openEuler
Operating systems & Components / Operating system

gnutls-help
Operating systems & Components / Operating system package or component

gnutls-devel
Operating systems & Components / Operating system package or component

gnutls-debuginfo
Operating systems & Components / Operating system package or component

gnutls-debugsource
Operating systems & Components / Operating system package or component

gnutls
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU51441

Risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20231

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in client sending key_share extension. A remote attacker can trick the victim to connect to a malicious server using a large Client Hello message over TLS 1.3, trigger a use-after-free error and crash the application or execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS - 20.03 LTS SP1

gnutls-help: before 3.6.14-7

gnutls-devel: before 3.6.14-7

gnutls-debuginfo: before 3.6.14-7

gnutls-debugsource: before 3.6.14-7

gnutls: before 3.6.14-7

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1109


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) Use-after-free

EUVDB-ID: #VU51442

Risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20232

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in client_send_params in lib/ext/pre_shared_key.c. A remote attacker can trick the victim to connect to a malicious server using a large Client Hello message over TLS 1.3, trigger a use-after-free error and crash the application or execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS - 20.03 LTS SP1

gnutls-help: before 3.6.14-7

gnutls-devel: before 3.6.14-7

gnutls-debuginfo: before 3.6.14-7

gnutls-debugsource: before 3.6.14-7

gnutls: before 3.6.14-7

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1109


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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