DescriptionCyrus SASL 2.1.23, 2.1.26, and earlier does not properly handle when a NULL value is returned upon an error by the crypt function as implemented in glibc 2.17 and later, which allows remote attackers to cause a denial of service (thread crash and consumption) via (1) an invalid salt or, when FIPS-140 is enabled, a (2) DES or (3) MD5 encrypted password, which triggers a NULL pointer dereference.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs716835, 784112

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cyrus-sasl2 (PTS)buster, buster (security)2.1.27+dfsg-1+deb10u2fixed
bullseye (security), bullseye2.1.27+dfsg-2.1+deb11u1fixed
sid, trixie2.1.28+dfsg1-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cyrus-sasl2sourcesqueeze(not affected)
cyrus-sasl2sourcewheezy(not affected)
cyrus-sasl2source(unstable)2.1.26.dfsg1-14716835, 784112


[wheezy] - cyrus-sasl2 <not-affected> (Only exploitable with eglibc 2.17 and later)
[squeeze] - cyrus-sasl2 <not-affected> (Only exploitable with eglibc 2.17 and later)
Was originally already fixed in 2.1.25.dfsg1-14 (cf. #716835)

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