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 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.
CVE-2021-22947
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2021-22947
https://github.com/curl/curl
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "n/a",
"product": "https://github.com/curl/curl",
"versions": [
{
"status": "affected",
"version": "curl 7.20.0 to and including 7.78.0"
}
]
}
]- Related CVEs
- CVE-2021-22947
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #21746 · Revision 1
- Added to Heist Feed
- Publisher date