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Debian 7: DLA-1015-1 Critical Key Exposure in Libgcrypt11 Cryptography

It was discovered that there was a key disclosure vulnerability in libgcrypt11 a library of cryptographic routines: It is well known that constant-time implementations of modular exponentiation . Hash: SHA256 Package : libgcrypt11 Version : 1.5.0-5+deb7u6 CVE ID : CVE-2017-7526 It was discovered that there was a key disclosure vulnerability in libgcrypt11 a library of cryptographic routines: It is well known that constant-time implementations of modular exponentiation cannot use sliding windows. However, software libraries such as Libgcrypt, used by GnuPG, continue to use sliding windows. It is widely believed that, even if the complete pattern of squarings and multiplications is observed through a side-channel attack, the number of exponent bits leaked is not sufficient to carry out a full key-recovery attack against RSA. Specifically, 4-bit sliding windows leak only 40% of the bits, and 5-bit sliding windows leak only 33% of the bits. -- Sliding right into disaster: Left-to-right sliding windows leak For Debian 7 "Wheezy", this issue has been fixed in libgcrypt11 version 1.5.0-5+deb7u6. We recommend that you upgrade your libgcrypt11 packages. Regards, - -- ,'`. : :' : Chris Lamb `. `'` This email address is being protected from spambots. You need JavaScript enabled to view it. / chris-lamb.co.uk `- . Libgcrypt11 security vulnerability resolved in update for Debian 7 Wheezy. Ensure to upgrade to avert potential cryptographic risks.. libgcrypt11 security, Debian update, cryptography patch, key exposure fix. . Severity: Critical. LinuxSecurity.com Team

Jul 06, 2017 •Critical Debian LTS