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Vulnerability · Published Jun 11, 2021 · Assigned by hackerone

CVE-2021-22897

Medium 5.3

In plain English

A medium-severity security flaw in https://github.com/curl/curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 4.3% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)4.3%top 8.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20curl0ALPINE-CVE-2021-22897
Alpine:v3.21curl0ALPINE-CVE-2021-22897
Alpine:v3.22curl0ALPINE-CVE-2021-22897
Alpine:v3.23curl0ALPINE-CVE-2021-22897
Alpine:v3.24curl0ALPINE-CVE-2021-22897

Affected products (as reported)

VendorProductVersions
n/a https://github.com/curl/curl 7.61.0 through 7.76.1

Weakness: CWE-840 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References