Man-in-the-Middle (MitM) attack in curl (Alpine package)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-22890 |
| CWE-ID | CWE-300 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
curl (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Man-in-the-Middle (MitM) attack
EUVDB-ID: #VU51822
Risk: Medium
CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-22890
CWE-ID:
CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to an error when handling 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. The reason for this confusion is the modified sequence from TLS 1.2 when the session ids would provided only during the TLS handshake, while in TLS 1.3 it happens post hand-shake and the code was not updated to take that changed behavior into account.
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.
This flaw can allow a malicious HTTPS proxy to MITM the traffic. 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.
MitigationInstall update from vendor's website.
Vulnerable software versionscurl (Alpine package): 7.63.0-r0 - 7.75.0-r0
CPE2.3- cpe:2.3:a:alpine:curl_alpine_package:7.63.0-r0:*:*:*:*:alpine_linux:*:3.9
- cpe:2.3:a:alpine:curl_alpine_package:7.64.0-r0:*:*:*:*:alpine_linux:*:3.9
- cpe:2.3:a:alpine:curl_alpine_package:7.64.0-r1:*:*:*:*:alpine_linux:*:3.9
https://git.alpinelinux.org/aports/commit/?id=c9e14a70b6c1f965cd7a4079799dd2e3daf531a5
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
