Multiple vulnerabilities in Matrix Synapse



Published: 2021-03-01
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2021-21273
CVE-2021-21274
CWE ID CWE-601
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Synapse
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor

Security Advisory

1) Open redirect

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-21273

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Synapse: before 1.25.0

CPE External links

https://github.com/matrix-org/synapse/commit/30fba6210834a4ecd91badf0c8f3eb278b72e746
https://github.com/matrix-org/synapse/pull/8821
https://github.com/matrix-org/synapse/releases/tag/v1.25.0
https://github.com/matrix-org/synapse/security/advisories/GHSA-v936-j8gp-9q3p

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) Input validation error

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21274

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when requesting the .well-known file. A remote attacker can trick a victim to connect a specially crafted homeserver and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Synapse: before 1.25.0

CPE External links

https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6
https://github.com/matrix-org/synapse/pull/8950
https://github.com/matrix-org/synapse/releases/tag/v1.25.0
https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8

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.



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