F5-K000159546: Low severity F5 F5OS-A vulnerability
CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.setnpnprotocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).
Affected Software
Event History
Frequently Asked Questions
What is the severity of F5-K000159546?
The severity of F5-K000159546 is considered low.
How do I fix F5-K000159546?
To fix F5-K000159546, ensure that valid protocols are configured for SSLContext.set_npn_protocols() instead of an empty list.
Which products are affected by F5-K000159546?
F5-K000159546 affects F5OS-A versions from 1.5.1 to 1.8.3 and F5OS-C versions from 1.6.0 to 1.8.2.
What is the nature of the vulnerability in F5-K000159546?
F5-K000159546 is a buffer over-read vulnerability resulting from configuring an invalid empty list for NPN protocols.
Is there a known CVE related to F5-K000159546?
Yes, F5-K000159546 is related to CVE-2024-5535, which pertains to the underlying OpenSSL API.