NetSight
IP …
medium5.9

CVE-2021-22947

When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and sen…

Impact

When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.

Affected products

VendorProductAffected versions
HaxxCurl
from 7.20.0 before 7.79.0
FedoraprojectFedora
Versions 33, 35
DebianDebian Linux
Versions 9.0, 10.0, 11.0
NetappCloud Backup
All versions
NetappClustered Data Ontap
All versions
NetappH300s Firmware
All versions
NetappH500s Firmware
All versions
NetappH700s Firmware
All versions
NetappH300e Firmware
All versions
NetappH500e Firmware
All versions
NetappH700e Firmware
All versions
NetappH410s Firmware
All versions

Weakness classification

CWE-310CWE-345

References