SARA / Free Tools / CVE / CVE-2018-0733

CVE-2018-0733 — Because of an implementation bug the PA-RISC CRYPTO_memcmp function is effective

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 guarantee

CVSS
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EPSS
1.96% (top 16.70%)
CWE
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Published
2018-03-27T21:00:00.000Z
Last modified
2024-09-16T20:46:46.842Z
CVSS vector
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01What is this vulnerability?

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…

02Affected products

VendorProductVersions
OpenSSLOpenSSLFixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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