CVE-2018-6829
Published: 07 February 2018
cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation.
Priority
Medium
CVSS 3 base score: 7.5
Status
| Package | Release | Status |
|---|---|---|
|
gnupg Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Not vulnerable
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
|
|
|
libgcrypt11 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Does not exist
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Does not exist
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Not vulnerable
|
|
|
libgcrypt20 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Not vulnerable
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Not vulnerable
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
(trusty was not-affected)
|
Notes
| Author | Note |
|---|---|
| mdeslaur | this is a flaw in applications that misuse libgcrypt as of 2018-05-31, no actionable action in libgcrypt, marking as not-affected |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6829
- https://github.com/weikengchen/attack-on-libgcrypt-elgamal
- https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki
- https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html
- https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004401.html
- NVD
- Launchpad
- Debian