[manjaro-security] [ASA-202103-1] gnutls: arbitrary code execution
Morten Linderud via arch-security
arch-security at lists.archlinux.org
Sat Mar 20 13:14:10 CET 2021
Arch Linux Security Advisory ASA-202103-1
=========================================
Severity: Low
Date : 2021-03-13
CVE-ID : CVE-2021-20231 CVE-2021-20232
Package : gnutls
Type : arbitrary code execution
Remote : Yes
Link : https://security.archlinux.org/AVG-1674
Summary
=======
The package gnutls before version 3.7.1-1 is vulnerable to arbitrary
code execution.
Resolution
==========
Upgrade to 3.7.1-1.
# pacman -Syu "gnutls>=3.7.1-1"
The problems have been fixed upstream in version 3.7.1.
Workaround
==========
None.
Description
===========
- CVE-2021-20231 (arbitrary code execution)
A security issue was found in GnuTLS before version 3.7.1. It was found
that the client sending a "key_share" extension may result in
dereferencing a pointer no longer valid after realloc(). This only
happens in TLS 1.3 and only when the client sends a large Client Hello
message, e.g., when HRR is sent in a resumed session previously
negotiated large FFDHE parameters, because the initial allocation of
the buffer is large enough without having to call realloc().
- CVE-2021-20232 (arbitrary code execution)
A security issue was found in GnuTLS before version 3.7.1. It was found
that the client sending a "pre_share_key" extension may result in
dereferencing a pointer no longer valid after realloc(). This only
happens in TLS 1.3 and only when the client sends a large Client Hello
message, e.g., when HRR is sent in a resumed session previously
negotiated large FFDHE parameters, because the initial allocation of
the buffer is large enough without having to call realloc().
Impact
======
A remote attacker might be able to cause a denial of service or
possibly execute arbitrary code when a TLS client is resuming a TLS 1.3
session.
References
==========
https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10
https://gitlab.com/gnutls/gnutls/-/issues/1151
https://gitlab.com/gnutls/gnutls/-/merge_requests/1399
https://gitlab.com/gnutls/gnutls/-/commit/15beb4b193b2714d88107e7dffca781798684e7e
https://gitlab.com/gnutls/gnutls/-/commit/75a937d97f4fefc6f9b08e3791f151445f551cb3
https://security.archlinux.org/CVE-2021-20231
https://security.archlinux.org/CVE-2021-20232
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