Arch Linux Security Advisory ASA-201812-5

Severity: Low
Date : 2018-12-08
CVE-ID : CVE-2018-0734 CVE-2018-0735
Package : openssl
Type : private key recovery
Remote : Yes
Link : https://security.archlinux.org/AVG-792

Summary

The package openssl before version 1.1.1.a-1 is vulnerable to private
key recovery.

Resolution

Upgrade to 1.1.1.a-1.

pacman -Syu “openssl>=1.1.1.a-1”

The problems have been fixed upstream in version 1.1.1.a.

Workaround

None.

Description

• CVE-2018-0734 (private key recovery)

A timing vulnerability has been found in DSA signature generation in
openssl versions up to and including 1.1.1, where information is leaked
via a side channel when a BN is resized and could lead to private key
recovery.

• CVE-2018-0735 (private key recovery)

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable
to a timing side channel attack in openssl versions prior to 1.1.1a. An
attacker could use variations in the signing algorithm to recover the
private key.

Impact

A remote attacker might be able to recover a private ECDSA or DSA key
via a timing attack.

References

https://www.openssl.org/news/secadv/20181029.txt
https://www.openssl.org/news/secadv/20181030.txt
https://github.com/openssl/openssl/commit/8abfe72e8c1de1b95f50aa0d9134803b4d00070f
https://github.com/openssl/openssl/pull/7486
https://github.com/openssl/openssl/commit/b1d6d55ece1c26fa2829e2b819b038d7b6d692b4
https://security.archlinux.org/CVE-2018-0734
https://security.archlinux.org/CVE-2018-0735