CVE-2021-27293 Incorrect Regular Expression in RestSharp
A malicious server response can cause the RestSharp client to hang indefinitely due to a ReDoS vulnerability during date parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-27293?
CVE-2021-27293 is a high-severity denial of service vulnerability in n/a, published on 12 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
RestSharp < 106.11.8-alpha.0.13 uses a regular expression which is vulnerable to Regular Expression Denial of Service (ReDoS) when converting strings into DateTimes. If a server responds with a malicious string, the client using RestSharp will be stuck processing it for an exceedingly long time. Thus the remote server can trigger Denial of Service.
Weakness: CWE-697
Which versions are affected by CVE-2021-27293?
2 open source packages ship an affected version, including RestSharp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
RestSharp NuGet | All versions | 106.11.8-alpha.0.13 |
RestSharp NuGet | All versions | 106.11.8-alpha.0.13 |
Products include Restsharp Restsharp.
How do I fix CVE-2021-27293?
Upgrade RestSharp to 106.11.8-alpha.0.13 or later.
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-2021-27293 being exploited?
There is no known exploitation of CVE-2021-27293 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as ECHO-ae7e-bb92-3687, GHSA-9pq7-rcxv-47vq.