8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
5.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
49.5%
A cached connection authenticated with the OAUTH2 mechanisms can be reused by a subsequent request even if the bearer is not correct.
This affects SASL-enabled protcols: SMPTP(S), IMAP(S), POP3(S) and LDAP(S) (openldap only).
An application that can be accessed by more than one user (such as a webmail server) would be affected by this flaw.
curl 'imap://server:port/path/;MAILINDEX=1' --login-options 'AUTH=OAUTHBEARER' -u user: --oauth2-bearer validbearer --next 'imap://server:port/path/;MAILINDEX=1' --login-options 'AUTH=OAUTHBEARER' -u user: --oauth2-bearer anything
As an alternative to apply the patch, use another (unused) password within each request: the second request in the command below will properly fail.
curl 'imap://server:port/path/;MAILINDEX=1' --login-options 'AUTH=OAUTHBEARER' -u user:dummy1 --oauth2-bearer validbearer --next 'imap://server:port/path/;MAILINDEX=1' --login-options 'AUTH=OAUTHBEARER' -u user:dummy2 --oauth2-bearer anything
Access (read/write) unauthorized data
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
5.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
49.5%