Astra Linux – Vulnerability in Python 3.7, Python 2.7

There is a flaw in the urllib’s AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server to which an HTTP client such as a web browser connects can trigger a Regular Expression Denial of Service ReDOS during an authentication request. This occurs when the server sends a...

CLSA-2026-1778535928 python: Fix of 2 CVEs

CVE-2021-3733: fix ReDoS in urllib2 AbstractBasicAuthHandler regex; the legacy '?:.,' prefix is replaced with the upstream-3.x form '?:^|,' and the scheme charset excludes ',' to prevent quadratic backtracking on crafted WWW-Authenticate headers - CVE-2021-23336: stop accepting ';' as a default...

Siemens SIMATIC S7-1500 Uncontrolled Resource Consumption (CVE-2021-3733)

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client such as web browser connects to, could trigger a Regular Expression Denial of Service ReDOS during an authentication request with a specially crafted payload that is sen...