CVE-2018-20200 — CertificatePinner

CertificatePinner.java in OkHttp 3.x through 3.12.0 allows man-in-the-middle attackers to bypass certificate pinning by changing SSLContext and the boolean values while hooking the application. NOTE: This id is disputed because some parties don't consider this is a vulnerabi

01What is this vulnerability?

CertificatePinner.java in OkHttp 3.x through 3.12.0 allows man-in-the-middle attackers to bypass certificate pinning by changing SSLContext and the boolean values while hooking the application. NOTE: This id is disputed because some parties don't consider this is a vulnerability. Their rationale can be found in https://github.com/square/okhttp/issues/4967

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-04-18T18:31:52.000Z
• Last modified: 2024-08-05T11:58:19.134Z

09References

• square.github.io — https://square.github.io/okhttp/3.x/okhttp/
• github.com — https://github.com/square/okhttp/releases
• github.com — https://github.com/square/okhttp/commits/master
• cxsecurity.com — https://cxsecurity.com/issue/WLB-2018120252
• github.com — https://github.com/square/okhttp/issues/4967
• lists.apache.org — https://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12e…
• lists.apache.org — https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e…
• lists.apache.org — https://lists.apache.org/thread.html/f9bc3e55f4e28d1dcd1a69aae6d53e609a758e34d28…
• lists.apache.org — https://lists.apache.org/thread.html/r0dd7ff197b2e3bdd80a0326587ca3d0c22e10d1dba…
• lists.apache.org — https://lists.apache.org/thread.html/r71100f23778d72fbd8be8baa6baffc159b9c4f3fae…
• lists.apache.org — https://lists.apache.org/thread.html/rc436d58531754ac8fe20340044566518ea4dce66ae…
• lists.apache.org — https://lists.apache.org/thread.html/recce57e195fbdd856dcf1933c136a8a66d7b02e05e…
• lists.apache.org — https://lists.apache.org/thread.html/rfd1eed12ba2a5dff37229edd60fc84a25517815d84…
• lists.apache.org — https://lists.apache.org/thread.html/r78bfce980843be61a55615a7680bbf7ac751a9b351…
• lists.apache.org — https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995…