[Pkg-openssl-devel] Bug#1060347: openssl: CVE-2023-6129

[Salvatore Bonaccorso]

Source: openssl
Version: 3.1.4-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>
Control: found -1 3.0.11-1~deb12u2

Hi,

The following vulnerability was published for openssl.

CVE-2023-6129[0]:
| Issue summary: The POLY1305 MAC (message authentication code)
| implementation contains a bug that might corrupt the internal state
| of applications running on PowerPC CPU based platforms if the CPU
| provides vector instructions.  Impact summary: If an attacker can
| influence whether the POLY1305 MAC algorithm is used, the
| application state might be corrupted with various application
| dependent consequences.  The POLY1305 MAC (message authentication
| code) implementation in OpenSSL for PowerPC CPUs restores the
| contents of vector registers in a different order than they are
| saved. Thus the contents of some of these vector registers are
| corrupted when returning to the caller. The vulnerable code is used
| only on newer PowerPC processors supporting the PowerISA 2.07
| instructions.  The consequences of this kind of internal application
| state corruption can be various - from no consequences, if the
| calling application does not depend on the contents of non-volatile
| XMM registers at all, to the worst consequences, where the attacker
| could get complete control of the application process. However
| unless the compiler uses the vector registers for storing pointers,
| the most likely consequence, if any, would be an incorrect result of
| some application dependent calculations or a crash leading to a
| denial of service.  The POLY1305 MAC algorithm is most frequently
| used as part of the CHACHA20-POLY1305 AEAD (authenticated encryption
| with associated data) algorithm. The most common usage of this AEAD
| cipher is with TLS protocol versions 1.2 and 1.3. If this cipher is
| enabled on the server a malicious client can influence whether this
| AEAD cipher is used. This implies that TLS server applications using
| OpenSSL can be potentially impacted. However we are currently not
| aware of any concrete application that would be affected by this
| issue therefore we consider this a Low severity security issue.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-6129
    https://www.cve.org/CVERecord?id=CVE-2023-6129
[1] https://www.openssl.org/news/secadv/20240109.txt

Regards,
Salvatore