Vulnerability Description
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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | >= 1.1.0, <= 1.1.0g |
References
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/103517Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040576Third Party AdvisoryVDB Entry
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56d5a4bfcaf37fa
- https://security.gentoo.org/glsa/201811-21
- https://security.netapp.com/advisory/ntap-20180330-0002/Third Party Advisory
- https://www.openssl.org/news/secadv/20180327.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.tenable.com/security/tns-2018-04
- https://www.tenable.com/security/tns-2018-06
- https://www.tenable.com/security/tns-2018-07
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
FAQ
What is CVE-2018-0733?
CVE-2018-0733 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 woul...
How severe is CVE-2018-0733?
CVE-2018-0733 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-0733?
Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl.