Medium severity · published Jan 30, 2020
CVE-2020-8492
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service…
6.5
CVSS
6.6%
EPSS
No
On KEV
Description
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)6.6% · higher than 94% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0 · source: NVD
FE
Fedora · Fedoraproject
31; 32 · source: NVD
LE
Leap · Opensuse
15.1 · source: NVD
PY
Python · Python
2.7.0 through 2.7.17; 3.5.0 through 3.5.9; 3.6.0 through 3.6.10; 3.7.0 through 3.7.6; 3.8.0 through 3.8.1 · source: NVD
UL
Ubuntu Linux · Canonical
12.04; 14.04; 16.04; 18.04; 19.10; 20.04 · source: NVD
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8492
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-8492
bugs.python.org
https://bugs.python.org/issue39503
python-security.readthedocs.io
https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html
github.com
https://github.com/python/cpython/pull/18284
security.netapp.com
https://security.netapp.com/advisory/ntap-20200221-0001/
vendor-advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html
vendor-advisory
https://usn.ubuntu.com/4333-1/
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