CVE-2021-22947 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://hackerone.com/reports/1334763 https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html [debian-lts-announce] 20210930 [SECURITY] [DLA 2773-1] curl security update https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/ https://www.oracle.com/security-alerts/cpuoct2021.html https://security.netapp.com/advisory/ntap-20211029-0003/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/ https://www.oracle.com/security-alerts/cpujan2022.html https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf https://support.apple.com/kb/HT213183 http://seclists.org/fulldisclosure/2022/Mar/29 https://www.oracle.com/security-alerts/cpuapr2022.html 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. cpe:2.3:a:haxx:curl::::::::

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9