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Mageia: 2021-0294 Critical Update for Libgcrypt ElGamal Security

mageia
Calendar Grey June 28, 2021
Dist Mageia Esm H88
Mageia has released a vital security patch for libgcrypt to rectify a vulnerability related to ElGamal encryption that could be exploited through certain attack vectors.
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window siz...

Summary

Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately (CVE-2021-33560).

References

- https://bugs.mageia.org/show_bug.cgi?id=29162

- https://lists.suse.com/pipermail/sle-security-updates/2021-June/009053.html

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- https://www.cve.org/CVERecord?id=CVE-2021-33560

Topics%20covered

Topics Covered

security advisory package update critical fix encryption issue side-channel attack libgcrypt Mageia

Resolution

SRPMS

- 8/core/libgcrypt-1.8.7-1.1.mga8

- 7/core/libgcrypt-1.8.5-1.1.mga7

Severity
critical
Lowest
Low
Medium
High
Critical

Publication date: 28 Jun 2021
URL: https://advisories.mageia.org/MGASA-2021-0294.html
Type: security
CVE: CVE-2021-33560

Topics%20covered

Topics Covered

security advisory package update critical fix encryption issue side-channel attack libgcrypt Mageia

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