SUSE update for curl
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-22876 CVE-2021-22890 |
| CWE-ID | CWE-200 CWE-300 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
SUSE MicroOS Operating systems & Components / Operating system SUSE Linux Enterprise Module for Basesystem Operating systems & Components / Operating system libcurl4-32bit-debuginfo Operating systems & Components / Operating system package or component libcurl4-32bit Operating systems & Components / Operating system package or component libcurl-devel Operating systems & Components / Operating system package or component libcurl4-debuginfo Operating systems & Components / Operating system package or component libcurl4 Operating systems & Components / Operating system package or component curl-debugsource Operating systems & Components / Operating system package or component curl-debuginfo Operating systems & Components / Operating system package or component curl Operating systems & Components / Operating system package or component |
| Vendor | SUSE |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU51821
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-22876
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to libcurl does not strip off user credentials from the URL when automatically populating the Referer:
HTTP request header field in outgoing HTTP requests and therefore
risks leaking sensitive data to the server that is the target of the
second HTTP request.
Update the affected package curl to the latest version.
Vulnerable software versionsSUSE MicroOS: 5.0
SUSE Linux Enterprise Module for Basesystem: 15-SP2
libcurl4-32bit-debuginfo: before 7.66.0-4.14.1
libcurl4-32bit: before 7.66.0-4.14.1
libcurl-devel: before 7.66.0-4.14.1
libcurl4-debuginfo: before 7.66.0-4.14.1
libcurl4: before 7.66.0-4.14.1
curl-debugsource: before 7.66.0-4.14.1
curl-debuginfo: before 7.66.0-4.14.1
curl: before 7.66.0-4.14.1
CPE2.3- cpe:2.3:o:suse:suse_microos:5.0:*:*:*:*:*:*:*
- cpe:2.3:o:suse:suse_linux_enterprise_module_for_basesystem:15-SP2:*:*:*:*:*:*:*
- cpe:2.3:o:suse:libcurl4-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4-32bit:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl-devel:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl-debugsource:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl:*:*:*:*:*:suse_linux:*:*
https://www.suse.com/support/update/announcement/2021/suse-su-20211006-1/
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.
2) 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.
MitigationUpdate the affected package curl to the latest version.
Vulnerable software versionsSUSE MicroOS: 5.0
SUSE Linux Enterprise Module for Basesystem: 15-SP2
libcurl4-32bit-debuginfo: before 7.66.0-4.14.1
libcurl4-32bit: before 7.66.0-4.14.1
libcurl-devel: before 7.66.0-4.14.1
libcurl4-debuginfo: before 7.66.0-4.14.1
libcurl4: before 7.66.0-4.14.1
curl-debugsource: before 7.66.0-4.14.1
curl-debuginfo: before 7.66.0-4.14.1
curl: before 7.66.0-4.14.1
CPE2.3- cpe:2.3:o:suse:suse_microos:5.0:*:*:*:*:*:*:*
- cpe:2.3:o:suse:suse_linux_enterprise_module_for_basesystem:15-SP2:*:*:*:*:*:*:*
- cpe:2.3:o:suse:libcurl4-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4-32bit:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl-devel:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:libcurl4:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl-debugsource:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl-debuginfo:*:*:*:*:*:suse_linux:*:*
- cpe:2.3:o:suse:curl:*:*:*:*:*:suse_linux:*:*
https://www.suse.com/support/update/announcement/2021/suse-su-20211006-1/
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.
