CVE-2020-15117 Denial of Service in Synergy

What is CVE-2020-15117?

CVE-2020-15117 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 15 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.

Weakness: CWE-754, CWE-755

Which versions are affected by CVE-2020-15117?

It affects 2 products.

Products include Fedoraproject Fedora, Symless Synergy.

How do I fix CVE-2020-15117?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-15117 being exploited?

There is no known exploitation of CVE-2020-15117 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-chfm-333q-gfpp, MGASA-2021-0040, UBUNTU-CVE-2020-15117.