Debian update for openssl1.0



Published: 2018-12-20
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2018-0732
CVE-2018-0734
CVE-2018-0737
CVE-2018-5407
CWE-ID CWE-20
CWE-200
CWE-208
Exploitation vector Network
Public exploit Public exploit code for vulnerability #4 is available.
Vulnerable software
Subscribe
Debian Linux
Operating systems & Components / Operating system

Vendor Debian

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU13325

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0732

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to improper handling of large prime values by the affected software during key agreement operations in a Transport Layer Security (TLS) handshake using an Ephemeral Diffie-Hellman (DHE) based cipher suite. A remote attacker can send a large prime value from a malicious OpenSSL server to a targeted OpenSSL client and cause the client to stop responding while generating a key for the prime value.

Mitigation

Update the affected package to version: 1.0.2q-1~deb9u1

Vulnerable software versions

Debian Linux: All versions

External links

http://www.debian.org/security/2018/dsa-4355


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.

2) Information disclosure

EUVDB-ID: #VU15668

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-2018-0734

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 unspecified flaw in Digital Signature Algorithm (DSA). A local attacker can conduct a timing side-channel attack and recover the private key, which could be used to conduct further attacks.

Mitigation

Update the affected package to version: 1.0.2q-1~deb9u1

Vulnerable software versions

Debian Linux: All versions

External links

http://www.debian.org/security/2018/dsa-4355


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.

3) Information disclosure

EUVDB-ID: #VU11854

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0737

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists in the RSA key generation algorithm's BN_mod_inverse() and BN_mod_exp_mont() functions due to a cache timing side channel attack. A local attacker can recover the private key.

Mitigation

Update the affected package to version: 1.0.2q-1~deb9u1

Vulnerable software versions

Debian Linux: All versions

External links

http://www.debian.org/security/2018/dsa-4355


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.

4) Side-channel attack

EUVDB-ID: #VU15723

Risk: Low

CVSSv3.1: 4.4 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:U/RC:C]

CVE-ID: CVE-2018-5407

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

Exploit availability: Yes

Description

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

The vulnerability exists due to due to execution of engine sharing on SMT (e.g.Hyper-Threading) architectures when improper handling of information by the processor. A physical attacker can construct a timing side channel to hijack information from processes that are running in the same core.

Note: the vulnerability has been dubbed as PortSmash microarchitecture bug.

Mitigation

Update the affected package to version: 1.0.2q-1~deb9u1

Vulnerable software versions

Debian Linux: All versions

External links

http://www.debian.org/security/2018/dsa-4355


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



###SIDEBAR###