F5-K000151520: F5 BIG-IQ Centralized Management vulnerability
CVE-2018-20852 http.cookiejar.DefaultPolicy.domainreturnok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3. CVE-2014-4616 Array index error in the scanstring function in the json module in Python 2.7 through 3.5 and simplejson before 2.6.1 allows context-dependent attackers to read arbitrary process memory via a negative index value in the idx argument to the rawdecode function. CVE-2013-7040 Python 2.7 before 3.4 only uses the last eight bits of the prefix to randomize hash values, which causes it to compute hash values without restricting the ability to trigger hash collisions predictably and makes it easier for context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-1150.
Affected Software
Event History
Frequently Asked Questions
What is the severity of F5-K000151520?
The severity of F5-K000151520 is considered high due to the potential for replay attacks on user sessions.
How do I fix F5-K000151520?
To address F5-K000151520, upgrade to Python version 3.7.3 or newer to ensure proper domain validation.
What systems are affected by F5-K000151520?
F5-K000151520 affects F5 BIG-IP and BIG-IQ Centralized Management systems prior to the patch.
Can F5-K000151520 lead to cookie theft?
Yes, F5-K000151520 can facilitate cookie theft if an attacker tricks the system into sending cookies to an unauthorized server.
Is there a mitigation for F5-K000151520 if I cannot upgrade?
If you cannot upgrade, consider configuring your applications to restrict cookie transmission based on trusted domains.