GnuPG 1.x before 1.4.16 generates RSA keys using sequences of introductions with certain patterns that introduce a side channel, which allows physically proximate attackers to extract RSA keys via a chosen-ciphertext attack and acoustic cryptanalysis during decryption. NOTE: applications are not typically expected to protect themselves from acoustic side-channel attacks, since this is arguably the responsibility of the physical device. Accordingly, issues of this type would not normally receive a CVE identifier. However, for this issue, the developer has specified a security policy in which GnuPG should offer side-channel resistance, and developer-specified security-policy violations are within the scope of CVE.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-4576
• https://exchange.xforce.ibmcloud.com/vulnerabilities/89846
• http://lists.gnupg.org/pipermail/gnupg-devel/2013-December/028102.html
• http://osvdb.org/101170
• http://rhn.redhat.com/errata/RHSA-2014-0016.html
• http://seclists.org/oss-sec/2013/q4/520
• http://seclists.org/oss-sec/2013/q4/523
• http://www.cs.tau.ac.il/~tromer/acoustic/
• http://www.debian.org/security/2013/dsa-2821
• http://www.securityfocus.com/bid/64424
• http://www.securitytracker.com/id/1029513
• http://www.tau.ac.il/~tromer/papers/acoustic-20131218.pdf
• http://www.ubuntu.com/usn/USN-2059-1