7.5

CVE-2018-10903: canonical ubuntu_linux Improper Input Validation

CVSS: 7.5v3.0HighModified
AliasesMGASA-2018-0429SUSE-SU-2018:3392-1SUSE-SU-2018:3553-1
Published 30-07-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-10903 is a high (CVSS 7.5) Improper Input Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 3.20% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (CVE.org)
EPSS score
3.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-07-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.

CVSS metrics

8 scores · 6 sources · 3 versions

EPSS trend

Probability

3.20%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
3.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse66 products
  • python-cffi&distro=HPE Helion OpenStack 8< 1.11.2-5.11.1
  • python-cffi&distro=SUSE Enterprise Storage 5< 1.11.2-5.11.1
  • python-cffi&distro=SUSE Linux Enterprise Server 12 SP1-LTSS< 1.11.2-2.19.2
  • python-cffi&distro=SUSE Linux Enterprise Server 12 SP2-BCL< 1.11.2-5.11.1
  • python-cffi&distro=SUSE Linux Enterprise Server 12 SP2-LTSS< 1.11.2-5.11.1
Mageia4 products
  • python-asn1crypto< 0.22.0-1.1.mga6
  • python-cffi< 1.7.0-1.mga6
  • python-cryptography< 2.3.1-1.mga6
  • python-cryptography-vectors< 2.3.1-1.mga6
Redhat4 products
  • openstack13
  • python-cryptography< 0:2.1.4-3.el7ost
  • python-cryptography-debuginfo< 0:2.1.4-3.el7ost
  • python2-cryptography< 0:2.1.4-3.el7ost
Opensuse3 products
  • python-cryptography-vectors&distro=openSUSE Leap 15.3< 2.9.2-150200.3.3.1
  • python-cryptography&distro=openSUSE Leap 15.3< 2.9.2-150200.13.1
  • python-cryptography&distro=openSUSE Leap Micro 5.2< 2.9.2-150200.13.1
[unknown]1 product
Canonical1 product
Cryptography1 product
Debian1 product
  • python-cryptography< 2.3-1
PyPI1 product
  • cryptography≥ 1.9.0, < 2.3 | ≥ 1.9, < 2.3
Ubuntu1 product
  • python-cryptography< 2.1.4-1ubuntu1.2

10 vendors · 83 products

References

37 links
Show all 37 references