CVE-2021-29432 Malicious users could control the content of invitation emails
Malicious users can control invitation email content in Sydent, enabling phishing attacks via arbitrary emails sent from the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-29432?
CVE-2021-29432 is a medium-severity vulnerability in matrix-org sydent, published on 15 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Sydent is a reference matrix identity server. A malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example. This issue has been fixed in 4469d1d.
Weakness: CWE-20
Which versions are affected by CVE-2021-29432?
3 open source packages ship an affected version, including matrix-sydent. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
matrix-sydent PyPI | All versions | 2.3.0 |
matrix-sydent PyPI | All versions | 2.3.0 |
matrix-sydent PyPI | All versions | 2.3.0 |
Products include Matrix Sydent.
How do I fix CVE-2021-29432?
Upgrade matrix-sydent to 2.3.0 or later.
Is CVE-2021-29432 being exploited?
There is no known exploitation of CVE-2021-29432 in the wild and no public exploit code.
Other vulnerabilities in matrix-org sydent
- CVE-2023-38686 Sydent does not verify email server certificates
- CVE-2021-29431 SSRF in Sydent due to missing validation of hostnames
- CVE-2021-29430 Denial of service attack via memory exhaustion
- CVE-2019-11842 matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG
- CVE-2019-11340 Matrix Sydent mishandles emails
Sources
Also known as GHSA-mh74-4m5g-fcjx, PYSEC-2021-23.