CVE-2021-20230

A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.

References

Affected packages

Git / github.com/mtrojnar/stunnel

Affected ranges

Type: GIT
Repo: https://github.com/mtrojnar/stunnel
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

ebad9ddc4efb2635f37174c9d800d06206f1edf9

Affected versions

stunnel-1.*

stunnel-1.0

stunnel-1.1

stunnel-1.2

stunnel-1.3

stunnel-1.4

stunnel-1.5

stunnel-1.6

stunnel-2.*

stunnel-2.0

stunnel-2.1

stunnel-3.*

stunnel-3.00

stunnel-3.01

stunnel-3.02

stunnel-3.03

stunnel-3.04

stunnel-3.05

stunnel-3.06

stunnel-3.07

stunnel-3.08

stunnel-3.09

stunnel-3.10

stunnel-3.11

stunnel-3.12

stunnel-3.13

stunnel-3.14

stunnel-3.15

stunnel-3.16

stunnel-3.17

stunnel-3.18

stunnel-3.19

stunnel-3.20

stunnel-3.21

stunnel-3.22

stunnel-4.*

stunnel-4.00

stunnel-4.01

stunnel-4.02

stunnel-4.03

stunnel-4.04

stunnel-4.05

stunnel-4.06

stunnel-4.07

stunnel-4.08

stunnel-4.09

stunnel-4.10

stunnel-4.11

stunnel-4.12

stunnel-4.13

stunnel-4.14

stunnel-4.15

stunnel-4.16

stunnel-4.17

stunnel-4.18

stunnel-4.19

stunnel-4.20

stunnel-4.21

stunnel-4.22

stunnel-4.23

stunnel-4.24

stunnel-4.25

stunnel-4.26

stunnel-4.27

stunnel-4.28

stunnel-4.29

stunnel-4.30

stunnel-4.31

stunnel-4.32

stunnel-4.33

stunnel-4.34

stunnel-4.35

stunnel-4.36

stunnel-4.37

stunnel-4.38

stunnel-4.39

stunnel-4.40

stunnel-4.41

stunnel-4.42

stunnel-4.43

stunnel-4.44

stunnel-4.45

stunnel-4.46

stunnel-4.47

stunnel-4.48

stunnel-4.49

stunnel-4.50

stunnel-4.51

stunnel-4.52

stunnel-4.53

stunnel-4.54

stunnel-4.55

stunnel-4.56

stunnel-4.57

stunnel-5.*

stunnel-5.00

stunnel-5.01

stunnel-5.02

stunnel-5.03

stunnel-5.04

stunnel-5.05

stunnel-5.06

stunnel-5.07

stunnel-5.08

stunnel-5.09

stunnel-5.10

stunnel-5.11

stunnel-5.12

stunnel-5.13

stunnel-5.14

stunnel-5.15

stunnel-5.16

stunnel-5.17

stunnel-5.18

stunnel-5.19

stunnel-5.20

stunnel-5.21

stunnel-5.22

stunnel-5.23

stunnel-5.24

stunnel-5.25

stunnel-5.26

stunnel-5.27

stunnel-5.28

stunnel-5.29

stunnel-5.30

stunnel-5.31

stunnel-5.33

stunnel-5.34

stunnel-5.35

stunnel-5.36

stunnel-5.37

stunnel-5.38

stunnel-5.39

stunnel-5.40

stunnel-5.41

stunnel-5.42

stunnel-5.43

stunnel-5.44

stunnel-5.45

stunnel-5.46

stunnel-5.47

stunnel-5.48

stunnel-5.49

stunnel-5.50

stunnel-5.51

stunnel-5.52

stunnel-5.53

stunnel-5.54

stunnel-5.55

stunnel-5.56

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20230.json"