High severity · published Feb 14, 2020
CVE-2020-8843
An issue was discovered in Istio 1.3 through 1.3.6
7.4
CVSS
1.1%
EPSS
No
On KEV
Description
An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IS
Istio · Istio
1.3.0 through 1.3.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-8843
Patch
https://github.com/istio/istio/commits/master
Vendor Advisory
https://istio.io/news/security/
Vendor Advisory
https://istio.io/news/security/istio-security-2020-002/
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