CVE-2021-22897

Description

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.

Weakness classification

• support@hackerone.com: CWE-840
• nvd@nist.gov: CWE-668

Primary references

• support@hackerone.com — Patch, Third Party Advisory
• support@hackerone.com — Patch, Vendor Advisory
• support@hackerone.com — Patch, Third Party Advisory
• support@hackerone.com — Exploit, Issue Tracking, Third Party Advisory
• support@hackerone.com — Third Party Advisory
• support@hackerone.com — Patch, Third Party Advisory
• support@hackerone.com — Patch, Third Party Advisory
• support@hackerone.com — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Third Party Advisory