OpenSUSE Linux update for libressl

1) Memory-cache side-channel timing attack

EUVDB-ID: #VU14438

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-12434

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists due to information leak via memory caches when modular addition calculations may not run in constant time when private keys are used to generate Elliptic Curve Digital Signature Algorithm (ECDSA) or Digital Signature Algorithm (DSA) signatures. A local attacker can conduct memory-cache side-channel timing attacks and recover sensitive information, such as the ECDSA or DSA private keys used to generate the signatures, which could be used to conduct additional attacks.

Mitigation

Update the affected packages.

Vulnerable software versions

Opensuse: 42.3

External links

http://lists.opensuse.org/opensuse-security-announce/2018-09/msg00004.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cryptographic issues

EUVDB-ID: #VU14600

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8970

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to the int_x509_param_set_hosts() function in lib/libcrypto/x509/x509_vpm.c does not correctly handle a case where hostname lenght is zero that leads to silent hostname omission during domain name verification  process.

A remote unauthenticated attacker can create a specially crafted certificate, perform a man-in-the-middle (MitM) attack and gain access to sensitive information.

Mitigation

Update the affected packages.

Vulnerable software versions

Opensuse: 42.3

External links

http://lists.opensuse.org/opensuse-security-announce/2018-09/msg00004.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.