VDB-115112 · CVE-2018-0733 · BID 103517

OpenSSL up to 1.1.0g PA-RISC CRYPTO_memcmp input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.03

A vulnerability, which was classified as critical, has been found in OpenSSL up to 1.1.0g (Network Encryption Software). Affected by this issue is the function CRYPTO_memcmp of the component PA-RISC. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Because of an implementation bug the PA-RISC CRYPTO_memcmp function is effectively reduced to only comparing the least significant bit of each byte. This allows an attacker to forge messages that would be considered as authenticated in an amount of tries lower than that guaranteed by the security claims of the scheme. The module can only be compiled by the HP-UX assembler, so that only HP-UX PA-RISC targets are affected. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g).

The bug was discovered 03/27/2018. The weakness was disclosed 03/27/2018 as confirmed git commit (GIT Repository). The advisory is shared for download at git.openssl.org. This vulnerability is handled as CVE-2018-0733 since 11/30/2017. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/24/2023).

The vulnerability scanner Nessus provides a plugin with the ID 108775 (Fedora 26 : 1:openssl (2018-40dc8b8b16)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351343 (Amazon Linux Security Advisory for openssl: ALAS-2018-1065).

Upgrading to version 1.1.0h eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.openssl.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108775). The entries 79791, 95830, 97118 and 99028 are pretty similar.

Productinfo

Type

Name

Version

License

Support

  • end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108775
Nessus Name: Fedora 26 : 1:openssl (2018-40dc8b8b16)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 55734
OpenVAS Name: Fedora Update for openssl FEDORA-2018-40dc8b8b16
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: OpenSSL 1.1.0h
Patch: 56d5a4bfcaf37fa420aef2bb881aa55e61cf5f2f

Timelineinfo

11/30/2017 🔍
03/27/2018 +117 days 🔍
03/27/2018 +0 days 🔍
03/27/2018 +0 days 🔍
03/27/2018 +0 days 🔍
03/28/2018 +1 days 🔍
04/01/2018 +4 days 🔍
04/02/2018 +1 days 🔍
02/24/2023 +1789 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: FEDORA-2018-40dc8b8b16
Researcher: Peter Waltenberg
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0733 (🔍)
SecurityTracker: 1040576
SecurityFocus: 103517 - OpenSSL CVE-2018-0733 Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 03/28/2018 10:32
Updated: 02/24/2023 12:13
Changes: 03/28/2018 10:32 (80), 01/17/2020 09:35 (5), 02/06/2021 09:58 (3), 02/06/2021 10:01 (1), 02/24/2023 12:05 (3), 02/24/2023 12:13 (1)
Complete: 🔍

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