CVE-2017-9526
published 2017-06-11CVE-2017-9526: 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…
PriorityP429medium5.9CVSS 3.0
AVNACHPRNUINSUCHINAN
EPSS
2.32%
81.5th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | libgcrypt20 | < libgcrypt20 1.7.6-2 (bookworm) | libgcrypt20 1.7.6-2 (bookworm) |
| gnupg | libgcrypt | <= 1.7.6 | — |
CVSS provenance
nvdv3.05.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N
osv6.8MEDIUM
vendor_ubuntu6.1MEDIUM
vendor_debian5.9MEDIUM
vendor_redhat5.9MEDIUM
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Ubuntu
Libgcrypt vulnerabilities
vendor_ubuntu·2017-07-03·CVSS 6.1
CVE-2017-7526 [MEDIUM] Libgcrypt vulnerabilities
Title: Libgcrypt vulnerabilities
Summary: Several security issues were fixed in Libgcrypt.
Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and
Yuval Yarom discovered that Libgcrypt was susceptible to an attack via
side channels. A local attacker could use this attack to recover RSA
private keys. (CVE-2017-7526)
It was discovered that Libgcrypt was susceptible to an attack via
side channels. A local attacker could use this attack to possibly recover
EdDSA private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu
16.10 and Ubuntu 17.04. (CVE-2017-9526)
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
libgcrypt: Possible timing attack on EdDSA session key
vendor_redhat·2017-06-01·CVSS 5.9
CVE-2017-9526 [MEDIUM] CWE-385 libgcrypt: Possible timing attack on EdDSA session key
libgcrypt: Possible timing attack on EdDSA session key
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.
Statement: This issue did not affect the versions of libgcrypt as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not include support for EdDSA cipher.
Package: libgcrypt (Red Hat Enterprise Linux 5) - Not affected
Package: libgcrypt (Red Hat Enterprise Linux 6) - Not affected
Package: libgcrypt (Red Hat Enterprise Linux 7) - Not affected
Package: mingw-virt-viewer (Red Hat Enterprise Vir
Debian
CVE-2017-9526: libgcrypt20 - In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from si...
vendor_debian·2017·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526: libgcrypt20 - In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from si...
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.
Scope: local
bookworm: resolved (fixed in 1.7.6-2)
bullseye: resolved (fixed in 1.7.6-2)
forky: resolved (fixed in 1.7.6-2)
sid: resolved (fixed in 1.7.6-2)
trixie: resolved (fixed in 1.7.6-2)
GHSA
GHSA-665h-28h9-qh6v: In Libgcrypt before 1
ghsa_unreviewed·2022-05-14
CVE-2017-9526 [MEDIUM] CWE-200 GHSA-665h-28h9-qh6v: In Libgcrypt before 1
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.
OSV
libgcrypt11, libgcrypt20 vulnerabilities
osv·2017-07-03·CVSS 6.8
CVE-2017-7526 [MEDIUM] libgcrypt11, libgcrypt20 vulnerabilities
libgcrypt11, libgcrypt20 vulnerabilities
Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and
Yuval Yarom discovered that Libgcrypt was susceptible to an attack via
side channels. A local attacker could use this attack to recover RSA
private keys. (CVE-2017-7526)
It was discovered that Libgcrypt was susceptible to an attack via
side channels. A local attacker could use this attack to possibly recover
EdDSA private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu
16.10 and Ubuntu 17.04. (CVE-2017-9526)
OSV
CVE-2017-9526: In Libgcrypt before 1
osv·2017-06-11·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526: In Libgcrypt before 1
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key
bugzilla·2017-06-08·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key
CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key
An attacker who learns the EdDSA session key from side-channel observation during the signing process, can easily recover the long-term secret key. Storing the session key in secure memory ensures that constant time point operations are used in the MPI library.
Upstream fixes:
master: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=5a22de904a0a366ae79f03ff1e13a1232a89e26b
1.7.x: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56
Discussion:
Created libgcrypt tracking bugs for this issue:
Affects: fedora-all [bug 1459890]
Created mingw-libgcrypt tracking bugs for this issue:
Affects: epel-7 [bug 1459888]
Affects: fedora-all [bug 1459889
Bugzilla
CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
bugzilla·2017-06-08·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multip
Bugzilla
CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
bugzilla·2017-06-08·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
CVE-2017-9526 libgcrypt: Possible timing attack on EdDSA session key [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported vers
Bugzilla
CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [epel-7]
bugzilla·2017-06-08·CVSS 5.9
CVE-2017-9526 [MEDIUM] CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [epel-7]
CVE-2017-9526 mingw-libgcrypt: libgcrypt: Possible timing attack on EdDSA session key [epel-7]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of epel-7.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
Discussion:
Use the following template
http://www.debian.org/security/2017/dsa-3880http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlhttp://www.securityfocus.com/bid/99046https://bugzilla.suse.com/show_bug.cgi?id=1042326https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26bhttps://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlhttp://www.debian.org/security/2017/dsa-3880http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlhttp://www.securityfocus.com/bid/99046https://bugzilla.suse.com/show_bug.cgi?id=1042326https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26bhttps://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
2017-06-11
Published