CVE-2020-12692: canonical ubuntu_linux Authentication Bypass by Capture-replay
CVSS: 5.5v2.0MediumModified
AliasesGHSA-rqw2-hhrf-7936PYSEC-2020-56UBUNTU-CVE-2020-12692DEBIAN-CVE-2020-12692
Published 06-05-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-12692 is a medium (CVSS 5.5) Authentication Bypass by Capture-replay vulnerability in canonical ubuntu_linux. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v2.0 (NVD)EPSS score
0.70%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 1Timeline
- 06-05-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The EC2 API doesn't have a signature TTL check for AWS Signature V4. An attacker can sniff the Authorization header, and then use it to reissue an OpenStack token an unlimited number of times.
CVSS metrics
6 scores · 4 sources · 3 versionsMedium 5.3Preferred score · OSV · Pypi (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NSourcesSingle source
Medium 5.4Preferred score · OSV · Pypi (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Medium 5.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.70%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
0.00 pp
From 0.70% on 18-09-2026
18-09-202618-10-2026
EPSS score0.70%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-294Authentication Bypass by Capture-replayA capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
- CWE-347Improper Verification of Cryptographic SignatureThe product does not verify, or incorrectly verifies, the cryptographic signature for data.
Affected systems
Canonical1 product
- ubuntu_linuxEOL18.04
Debian1 product
- keystone< 2:17.0.0~rc2-1
Openstack1 product
- keystone< 15.0.1 | 16.0.0
PyPI1 product
- keystone≥ 16.0.0.0rc1, < 16.0.0 | < 15.0.1
Ubuntu1 product
- keystoneAll versions (No fix recorded) | < 2:13.0.4-0ubuntu1
5 vendors · 5 products
References
15 links- www.openwall.com/lists/oss-security/2020/05/06/4X Refsource MISCWEBREPORTMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2020/05/07/1Mailing ListX Refsource MLISTWEBThird Party Advisory
