CVE-2021-20788 Server-side request forgery in GroupSession

Medium 4.3 Published 28 Jul 2021 Updated 3 Aug 2024

Remote authenticated attackers can perform port scans and access internal web servers via SSRF in GroupSession.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20788?

CVE-2021-20788 is a medium-severity server-side request forgery vulnerability in Japan Total System Co.,Ltd. GroupSession, published on 28 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Server-side request forgery (SSRF) vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote authenticated attacker to conduct a port scan from the product and/or obtain information from the internal Web server.

Weakness: CWE-918

Which versions are affected by CVE-2021-20788?

It affects 3 products.

Products include Groupsession Groupsession, Groupsession Groupsession Bycloud, Groupsession Groupsession Zion.

How do I fix CVE-2021-20788?

No fix has been published for CVE-2021-20788 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2021-20788 being exploited?

There is no known exploitation of CVE-2021-20788 in the wild and no public exploit code.

Sources

Also known as GHSA-jvhx-hc7j-xvxh.