Bug 1839942 (CVE-2020-10752) - CVE-2020-10752 openshift/openshift-apiserver: oauthtokens leaked to logs on panic
Summary: CVE-2020-10752 openshift/openshift-apiserver: oauthtokens leaked to logs on p...
Keywords:
Status: NEW
Alias: CVE-2020-10752
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
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Depends On: 1846657 1846658 1846659 1846660 1846661 1846662 1839944 1839945
Blocks: 1838942
TreeView+ depends on / blocked
 
Reported: 2020-05-26 05:21 UTC by Jason Shepherd
Modified: 2023-07-07 08:28 UTC (History)
8 users (show)

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A flaw was found in the OpenShift API Server, where it failed to sufficiently protect OAuthTokens by leaking them into the logs when an API Server panic occurred. This flaw allows an attacker with the ability to cause an API Server error to read the logs, and use the leaked OAuthToken to log into the API Server with the leaked token.
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Description Jason Shepherd 2020-05-26 05:21:25 UTC 
The OpenShift API Server failed to sufficiently protect OAuthTokens by leaking them in the logs when a API Server panic occured. An attacker with the ability to cause a API Server panic, and read the logs and use the leaked OAuthToken to log into the API Server with the leaked token.
Comment 7 Jason Shepherd 2020-06-10 03:15:43 UTC 
The immediate problem is this line of code [1], however the fix is none trivial and requires a reworking of oauthtokens in OpenShift [2].

[1] https://github.com/openshift/origin/blob/master/vendor/k8s.io/kubernetes/staging/src/k8s.io/apiserver/pkg/server/filters/wrap.go#L39
[2] https://github.com/openshift/enhancements/pull/323
Comment 8 Jason Shepherd 2020-06-10 03:41:03 UTC 
Statement:

OAuthTokens are only valid for 1 day by default.
Comment 9 Jason Shepherd 2020-06-10 03:41:05 UTC 
Mitigation:

Ensure the OpenShift API Server logs are kept private
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