CVE-2021-43795

moderate-risk
Published 2021-12-02

Armeria is an open source microservice framework. In affected versions an attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains `%2F` (encoded `/`), such as `/files/..%2Fsecrets.txt`, bypassing Armeria's path validation logic. Armeria 1.13.4 or above contains the hardened path validation logic that handles `%2F` properly. This vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path.

Do I need to act?

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0.75% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Linecorp

References (6)

Patch https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284
Third Party Advisory https://github.com/line/armeria/pull/3855
Third Party Advisory https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv
Patch https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284
Third Party Advisory https://github.com/line/armeria/pull/3855
Third Party Advisory https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv
34
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal