Multiple vulnerabiities in Istio
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 7 |
| CVE-ID | CVE-2021-32777 CVE-2021-32781 CVE-2021-32778 CVE-2021-32780 CVE-2021-39155 CVE-2021-39156 CVE-2021-32779 |
| CWE-ID | CWE-285 CWE-416 CWE-834 CWE-754 CWE-200 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Istio Web applications / Other software |
| Vendor | Istio |
Security Bulletin
This security bulletin contains information about 7 vulnerabilities.
1) Improper Authorization
EUVDB-ID: #VU56106
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2021-32777
CWE-ID:
Exploit availability:
DescriptionThe 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.
Install update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
2) Use-after-free
EUVDB-ID: #VU56107
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2021-32781
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
3) Excessive Iteration
EUVDB-ID: #VU56147
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2021-32778
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
4) Improper Check for Unusual or Exceptional Conditions
EUVDB-ID: #VU56148
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2021-32780
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
5) Improper Authorization
EUVDB-ID: #VU56150
Risk: High
CVSSv3.1:
CVE-ID: CVE-2021-39155
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
6) Improper Authorization
EUVDB-ID: #VU56151
Risk: High
CVSSv3.1:
CVE-ID: CVE-2021-39156
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
7) Information disclosure
EUVDB-ID: #VU56149
Risk: High
CVSSv3.1:
CVE-ID: CVE-2021-32779
CWE-ID:
Exploit availability:
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsIstio: 1.9.0 - 1.11.0
Fixed software versionsCPE2.3 External links
http://istio.io/latest/news/security/istio-security-2021-008
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
