CVE-2019-15941

NameCVE-2019-15941
DescriptionOpenID Connect Issuer in LemonLDAP::NG 2.x through 2.0.5 may allow an attacker to bypass access control rules via a crafted OpenID Connect authorization request. To be vulnerable, there must exist an OIDC Relaying party within the LemonLDAP configuration with weaker access control rules than the target RP, and no filtering on redirection URIs.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4533-1
NVD severityhigh (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
lemonldap-ng (PTS)jessie1.3.3-1fixed
jessie (security)1.3.3-1+deb8u2fixed
stretch1.9.7-3+deb9u2vulnerable
stretch (security)1.9.7-3+deb9u1vulnerable
buster2.0.2+ds-7+deb10u1vulnerable
buster (security)2.0.2+ds-7+deb10u2fixed
bullseye, sid2.0.6+ds-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
lemonldap-ngsource(unstable)2.0.6+ds-1high
lemonldap-ngsourcebuster2.0.2+ds-7+deb10u2highDSA-4533-1
lemonldap-ngsourcejessie(not affected)

Notes

[stretch] - lemonldap-ng <ignored> (Restrictions on OIDC federation added in 2.0)
[jessie] - lemonldap-ng <not-affected> (Vulnerable code introduced later)
Vulnerability exists pre-2.0 versions, but as restrictions on OIDC federation
were added only in 2.0 the vulnerability has no effect. The vulnerability
itself exists only with versions >= 1.9.0 (as there is no OIDC before)

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