CVE-2021-22897
Summary
curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.
Impact & exploitability
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf ↗
Additional information
- NVD record
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch
- https://curl.se/docs/CVE-2021-22897.htmlPatch
- https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511Patch
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch
- https://security.netapp.com/advisory/ntap-20210727-0007/Advisory
- https://hackerone.com/reports/1172857Advisory