Multiple vulnerabiities in Istio

1) Improper Authorization

EUVDB-ID: #VU56106

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32777

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to an error in ext-authz extension when sending request headers to the external authorization service in Envoy. The application sends only the last header instead of merging multiple value headers according to the HTTP specification. A remote attacker can bypass authorization process and gain unauthorized access to the application, if ext-authz extension is used.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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: #VU56107

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32781

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when processing HTTP requests and responses in Envoy. A remote attacker can send a specially crafted HTTP request or response to the application, trigger a use-after-free error and perform a denial of service attack.

Successful exploitation of the vulnerability requires presence of extension that can modify and increase the size of request or response bodies.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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) Excessive Iteration

EUVDB-ID: #VU56147

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32778

CWE-ID: CWE-834 - Excessive Iteration

Exploit availability: No

Description

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

The vulnerability exists due to the Envoy is configured with high limit on H/2 concurrent streams. A remote attacker can cause a denial of service condition on the target system. 

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU56148

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32780

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

Exploit availability: No

Description

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

The vulnerability exists due to incorrect handling of H/2 GOAWAY followed by SETTINGS frames. A remote attacker can cause a denial of service condition on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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) Improper Authorization

EUVDB-ID: #VU56150

Risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39155

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization check.

The vulnerability exists due to case insensitive host comparison. A remote attacker can send a specially crafted request to bypass authorization on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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) Improper Authorization

EUVDB-ID: #VU56151

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39156

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to insufficient authorization checks. A remote attacker can send a specially crafted HTTP request with #fragment in the path and bypass authorization on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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.

7) Information disclosure

EUVDB-ID: #VU56149

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32779

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to incorrectly handling of URI "#fragment" element as part of the path element. A remote attacker can send a specially crafted request and gain unauthorized access to sensitive information on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Istio: 1.9.0 - 1.11.0

External links

http://istio.io/latest/news/security/istio-security-2021-008

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.