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CVE-2017-9526

Publication date 10 June 2017

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.

Read the notes from the security team

Status

Package Ubuntu Release Status
libgcrypt11 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
Not affected
libgcrypt20 19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Fixed 1.7.6-1ubuntu0.1
16.10 yakkety
Fixed 1.7.2-2ubuntu1.1
16.04 LTS xenial
Fixed 1.6.5-2ubuntu0.3
14.04 LTS trusty Not in release

Notes


tyhicks

EdDSA support was added in 1.6.0

Severity score breakdown

Parameter Value
Base score 5.9 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3347-1
    • Libgcrypt vulnerabilities
    • 3 July 2017

Other references