Critical severity · published Oct 26, 2020
CVE-2020-27743
libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes()
9.8
CVSS
1.7%
EPSS
No
On KEV
Description
libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PT
Pam Tacplus · Pam Tacplus Project
through 1.5.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27743
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-27743
Third Party Advisory
https://github.com/kravietz/pam_tacplus/pull/163
Technical Description
https://tools.ietf.org/html/rfc8907
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7.5
CVE-2020-13881
In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used