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CVE-2019-9578

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking...

7.5 HighFix available

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.30%Up 0.4 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
CVE-2019-9578
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-908
Updated
2026-11-02
CVE List No score

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
CVE-2019-9578
Updated
2026-11-02
EUVDEUVD-2019-18949 No score

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
EUVD-2019-18949
Updated
2026-11-03
GitHub AdvisoriesGHSA-6c8w-rwwq-6qqh 7.5

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking...

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
GHSA-6c8w-rwwq-6qqh
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-908
Updated
2026-11-02
OSV 7.5

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
CVE-2019-9578
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-9578 7.5

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
DEBIAN-CVE-2019-9578
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 8 moreShow less
OSVUBUNTU-CVE-2019-9578 7.5

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Record
UBUNTU-CVE-2019-9578
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2019:1708-1 No score

Security update for libu2f-host, pam_u2f

This update for libu2f-host and pam_u2f to version 1.0.8 fixes the following issues:

Security issues fixed for libu2f-host:

  • CVE-2019-9578: Fixed a memory leak due to a wrong parse of init's response (bsc#1128140).

Security issues fixed for pam_u2f:

  • CVE-2019-12209: Fixed an issue where symlinks in the user's directory were followed (bsc#1135729).
  • CVE-2019-12210: Fixed file descriptor leaks (bsc#1135727).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:1708-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:1725-1 No score

Security update for libu2f-host, pam_u2f

This update for libu2f-host and pam_u2f to version 1.0.8 fixes the following issues:

Security issues fixed for libu2f-host:

  • CVE-2019-9578: Fixed a memory leak due to a wrong parse of init's response (bsc#1128140).

Security issues fixed for pam_u2f:

  • CVE-2019-12209: Fixed an issue where symlinks in the user's directory were followed (bsc#1135729).
  • CVE-2019-12210: Fixed file descriptor leaks (bsc#1135727).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:1725-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:0799-1 No score

Security update for libu2f-host

This update for libu2f-host fixes the following issues:

This update ships the u2f-host package (jsc#ECO-3687 bsc#1184648)

Version 1.1.10 (released 2019-05-15)

  • Add new devices to udev rules.
  • Fix a potentially uninitialized buffer (CVE-2019-9578, bsc#1128140)

Version 1.1.9 (released 2019-03-06)

  • Fix CID copying from the init response, which broke compatibility with some devices.

Version 1.1.8 (released 2019-03-05)

  • Add udev rules
  • Drop 70-old-u2f.rules and use 70-u2f.rules for everything
  • Use a random nonce for setting up CID to prevent fingerprinting
  • CVE-2019-9578: Parse the response to init in a more stable way to prevent leakage of uninitialized stack memory back to the device (bsc#1128140).

Version 1.1.7 (released 2019-01-08)

  • Fix for trusting length from device in device init.

  • Fix for buffer overflow when receiving data from device. (YSA-2019-01, CVE-2018-20340, bsc#1124781)

  • Add udev rules for some new devices.

  • Add udev rule for Feitian ePass FIDO

    • Add a timeout to the register and authenticate actions. This update was imported from the SUSE:SLE-15:Update update project.
Record
openSUSE-SU-2021:0799-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:1755-1 No score

Security update for libu2f-host

This update for libu2f-host fixes the following issues:

This update ships the u2f-host package (jsc#ECO-3687 bsc#1184648)

Version 1.1.10 (released 2019-05-15)

  • Add new devices to udev rules.
  • Fix a potentially uninitialized buffer (CVE-2019-9578, bsc#1128140)

Version 1.1.9 (released 2019-03-06)

  • Fix CID copying from the init response, which broke compatibility with some devices.

Version 1.1.8 (released 2019-03-05)

  • Add udev rules
  • Drop 70-old-u2f.rules and use 70-u2f.rules for everything
  • Use a random nonce for setting up CID to prevent fingerprinting
  • CVE-2019-9578: Parse the response to init in a more stable way to prevent leakage of uninitialized stack memory back to the device (bsc#1128140).

Version 1.1.7 (released 2019-01-08)

  • Fix for trusting length from device in device init.

  • Fix for buffer overflow when receiving data from device. (YSA-2019-01, CVE-2018-20340, bsc#1124781)

  • Add udev rules for some new devices.

  • Add udev rule for Feitian ePass FIDO

    • Add a timeout to the register and authenticate actions.
Record
openSUSE-SU-2021:1755-1
Updated
2026-11-02
OSVSUSE-SU-2019:1749-1 No score

Security update for libu2f-host

This update for libu2f-host and pam_u2f to version 1.0.8 fixes the following issues:

Security issues fixed for libu2f-host:

  • CVE-2019-9578: Fixed a memory leak due to a wrong parse of init's response (bsc#1128140).
  • CVE-2018-20340: Fixed an unchecked buffer, which could allow a buffer overflow with a custom made malicious USB device (bsc#1124781).

Security issues fixed for pam_u2f:

  • CVE-2019-12209: Fixed an issue where symlinks in the user's directory were followed (bsc#1135729).
  • CVE-2019-12210: Fixed file descriptor leaks (bsc#1135727).
Record
SUSE-SU-2019:1749-1
Updated
2026-11-02
OSVSUSE-SU-2019:1750-1 No score

Security update for libu2f-host, pam_u2f

This update for libu2f-host and pam_u2f to version 1.0.8 fixes the following issues:

Security issues fixed for libu2f-host:

  • CVE-2019-9578: Fixed a memory leak due to a wrong parse of init's response (bsc#1128140).

Security issues fixed for pam_u2f:

  • CVE-2019-12209: Fixed an issue where symlinks in the user's directory were followed (bsc#1135729).
  • CVE-2019-12210: Fixed file descriptor leaks (bsc#1135727).
Record
SUSE-SU-2019:1750-1
Updated
2026-11-02
OSVSUSE-SU-2021:1755-1 No score

Security update for libu2f-host

This update for libu2f-host fixes the following issues:

This update ships the u2f-host package (jsc#ECO-3687 bsc#1184648)

Version 1.1.10 (released 2019-05-15)

  • Add new devices to udev rules.
  • Fix a potentially uninitialized buffer (CVE-2019-9578, bsc#1128140)

Version 1.1.9 (released 2019-03-06)

  • Fix CID copying from the init response, which broke compatibility with some devices.

Version 1.1.8 (released 2019-03-05)

  • Add udev rules
  • Drop 70-old-u2f.rules and use 70-u2f.rules for everything
  • Use a random nonce for setting up CID to prevent fingerprinting
  • CVE-2019-9578: Parse the response to init in a more stable way to prevent leakage of uninitialized stack memory back to the device (bsc#1128140).

Version 1.1.7 (released 2019-01-08)

  • Fix for trusting length from device in device init.

  • Fix for buffer overflow when receiving data from device. (YSA-2019-01, CVE-2018-20340, bsc#1124781)

  • Add udev rules for some new devices.

  • Add udev rule for Feitian ePass FIDO

    • Add a timeout to the register and authenticate actions.
Record
SUSE-SU-2021:1755-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libu2f-host
Debian:12
 before 1.1.9-1
1.1.9-1
libu2f-host
Debian:13
 before 1.1.9-1
1.1.9-1
libu2f-host
Debian:14
 before 1.1.9-1
1.1.9-1
libu2f-host
SUSE:Linux Enterprise Desktop 12 SP4
From an advisory covering 4 CVEs
 before 1.1.6-3.5.1
1.1.6-3.5.1
pam_u2f
SUSE:Linux Enterprise Desktop 12 SP4
From an advisory covering 4 CVEs
 before 1.0.8-3.3.1
1.0.8-3.3.1
libu2f-host
SUSE:Linux Enterprise Server 12 SP4
From an advisory covering 4 CVEs
 before 1.1.6-3.5.1
1.1.6-3.5.1
pam_u2f
SUSE:Linux Enterprise Server 12 SP4
From an advisory covering 4 CVEs
 before 1.0.8-3.3.1
1.0.8-3.3.1
libu2f-host
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 4 CVEs
 before 1.1.6-3.5.1
1.1.6-3.5.1
pam_u2f
SUSE:Linux Enterprise Server for SAP Applications 12 SP4
From an advisory covering 4 CVEs
 before 1.0.8-3.3.1
1.0.8-3.3.1
libu2f-host
SUSE:Linux Enterprise Module for Basesystem 15
From an advisory covering 3 CVEs
 before 1.1.6-3.6.1
1.1.6-3.6.1
Show 13 moreShow less
Affected packages
PackageAffectedFixed
pam_u2f
SUSE:Linux Enterprise Module for Basesystem 15
From an advisory covering 3 CVEs
 before 1.0.8-3.3.1
1.0.8-3.3.1
libu2f-host
SUSE:Linux Enterprise Module for Basesystem 15 SP1
From an advisory covering 3 CVEs
 before 1.1.6-3.6.1
1.1.6-3.6.1
pam_u2f
SUSE:Linux Enterprise Module for Basesystem 15 SP1
From an advisory covering 3 CVEs
 before 1.0.8-3.3.1
1.0.8-3.3.1
libu2f-host
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 2 CVEs
 before 1.1.10-3.9.1
1.1.10-3.9.1
libu2f-host
SUSE:Linux Enterprise Module for Basesystem 15 SP3
From an advisory covering 2 CVEs
 before 1.1.10-3.9.1
1.1.10-3.9.1
libu2f-host
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.0.4-11.0.0-1
 None known
libu2f-host
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.1.3-11.1.4-11.1.4-1ubuntu0.1
 None known
libu2f-host
openSUSE:Leap 15.1
From an advisory covering 3 CVEs
 before 1.1.6-lp151.2.6.1
1.1.6-lp151.2.6.1
pam_u2f
openSUSE:Leap 15.1
From an advisory covering 3 CVEs
 before 1.0.8-lp151.2.3.1
1.0.8-lp151.2.3.1
libu2f-host
openSUSE:Leap 15.0
From an advisory covering 3 CVEs
 before 1.1.6-lp150.10.1
1.1.6-lp150.10.1
pam_u2f
openSUSE:Leap 15.0
From an advisory covering 3 CVEs
 before 1.0.8-lp150.7.1
1.0.8-lp150.7.1
libu2f-host
openSUSE:Leap 15.2
From an advisory covering 2 CVEs
 before 1.1.10-lp152.4.3.1
1.1.10-lp152.4.3.1
libu2f-host
openSUSE:Leap 15.3
From an advisory covering 2 CVEs
 before 1.1.10-3.9.1
1.1.10-3.9.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-9578 is a high vulnerability (CVSS 7.5) in Yubico Libu2f-host, published March 5, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.30%, the 83rd percentile. Fixed in libu2f-host 1.1.9-1.

References

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