Low severity · published Apr 1, 2021
CVE-2021-22890
curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets
3.7
CVSS
3.1%
EPSS
No
On KEV
Description
curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.1% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HT
https://github.com/curl/curl ·
7.63.0 to and including 7.75.0 · source: vendor
CB
Communications Billing And Revenue Management · Oracle
12.0.0.3.0 · source: NVD
DL
Debian Linux · Debian
9.0 · source: NVD
ES
Essbase · Oracle
21.2 · source: NVD
FO
Fabric Operating System · Broadcom
All versions, or not specified · source: NVD
FE
Fedora · Fedoraproject
32; 33; 34 · source: NVD
HM
Hci Management Node · Netapp
All versions, or not specified · source: NVD
HS
Hci Storage Node · Netapp
All versions, or not specified · source: NVD
LI
Libcurl · Haxx
7.63.0 through 7.75.0 · source: NVD
SI
Sinec Infrastructure Network Services · Siemens
before 1.0.1.1 · source: NVD
SO
Solidfire · Netapp
All versions, or not specified · source: NVD
UF
Universal Forwarder · Splunk
8.2.0 before 8.2.12; 9.0.0 before 9.0.6; 9.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22890
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22890
Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Patch
https://curl.se/docs/CVE-2021-22890.html
Exploit
https://hackerone.com/reports/1129529
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/
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