PT-2021-17385 · Restsharp · Restsharp

Ben Caller · Published 2021-07-12 · Updated 2021-09-09 · CVE-2021-27293

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions RestSharp versions prior to 106.11.8-alpha.0.13

Description The issue arises from a vulnerable regular expression used when converting strings into DateTimes, making it susceptible to Regular Expression Denial of Service (ReDoS). If a server responds with a malicious string, the client using the affected software will be stuck processing it for an exceedingly long time, allowing the remote server to trigger a Denial of Service.

Recommendations For versions prior to 106.11.8-alpha.0.13, update to version 106.11.8-alpha.0.13 or later to resolve the issue. As a temporary workaround, consider restricting the use of the DateTime conversion function to minimize the risk of exploitation.

Exploit

Fix

Weakness Enumeration

CWE-697

CWE-185

Related Identifiers

CVE-2021-27293

GHSA-9PQ7-RCXV-47VQ

Affected Products

Restsharp

References · 7

• 🔥 https://github.com/restsharp/RestSharp/issues/1556 · Exploit
• https://osv.dev/vulnerability/CVE-2021-27293 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-9pq7-rcxv-47vq · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27293 · Security Note
• https://github.com/restsharp/RestSharp/commit/be39346784b68048b230790d15333574341143bc · Note
• https://restsharp.dev · Note
• https://t.me/cibsecurity/26055 · Telegram Post