Description
Libgcrypt before 1.5.4, as used in GnuPG and other products, does not properly perform ciphertext normalization and ciphertext randomization, which makes it easier for physically proximate attackers to conduct key-extraction attacks by leveraging the ability to collect voltage data from exposed metal, a different vector than CVE-2013-4576.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libgcrypt20 | 1.6.0-2 | — |
| Debian 13 | libgcrypt20 | 1.6.0-2 | — |
| Debian 12 | libgcrypt20 | 1.6.0-2 | — |
| Debian 7 | gnupg | 1.4.12-7+deb7u6 | DSA-3024-1 |
| Debian 7 | libgcrypt11 | 1.5.0-5+deb7u2 | DSA-3073-1 |
| Debian 6.0 | gnupg | 1.4.10-4+squeeze6 | DLA-54-1 |
| Debian 6.0 | libgcrypt11 | 1.4.5-2+squeeze2 | DLA-93-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | gnupg | 1.4.16-1ubuntu2.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | gnupg2 | 2.0.22-3ubuntu1.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | libgcrypt11 | 1.5.3-2ubuntu4.1 | USN-2339-2 |
Advisories 6
- USN-2339-2 libgcrypt11 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-93-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-54-1 gnupg - security-update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3073-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3024-1 gnupg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2554-1 gnupg, gnupg2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
References
- [gnupg-announce] 20140808 [security fix] Libgcrypt and GnuPG mailing-list
- DSA-3073 vendor-advisory
- [oss-security] 20140816 Re: CVE request: libgcrypt, ELGAMAL side-channel attack mailing-list
- http://www.cs.tau.ac.il/~tromer/handsoff/
- DSA-3024 vendor-advisory