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Mageia: MGASA-2020-0465 Moderate: TLS Attack and OpenSSL Bug

mageia
Calendar Grey December 21, 2020
Dist Mageia Esm H88
New compat-openssl10 updates resolve serious TLS vulnerabilities that could lead to unauthorized access and service interruptions.
The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellma...

Summary

The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites. (CVE-2020-1968)
The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSS...

Read the Full Advisory

References

- https://bugs.mageia.org/show_bug.cgi?id=27305

- https://openssl-library.org/news/secadv/20200909.txt

- https://ubuntu.com/security/notices/USN-4504-1

- https://openssl-library.org/news/secadv/20201208.txt

- https://lists.debian.org/debian-security-announce/2020/msg00214.html

- https://ubuntu.com/security/notices/USN-4662-1

- https://www.cve.org/CVERecord?id=CVE-2020-1968

- https://www.cve.org/CVERecord?id=CVE-2020-1971

Resolution

SRPMS

- 7/core/compat-openssl10-1.0.2u-1.1.mga7

Publication date: 21 Dec 2020
URL: https://advisories.mageia.org/MGASA-2020-0465.html
Type: security
CVE: CVE-2020-1968, CVE-2020-1971

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