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CVE-2013-4122

Published: 18 July 2013

Cyrus 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.

Priority

Medium

Notes

AuthorNote
seth-arnold
NULL return from crypt() if the salt isn't sane
Upgraded to medium, bug report shows remote attackers can disable
the sasl service by repeating the attack; THREADS=0 configuration is a
work-around that may help to prevent abuse.
mdeslaur
eglibc only returns NULL from crypt() in 2.17+, so quantal
and older are not affected.
2015-09-25: patch was dropped by mistake in debian's
2.1.26 package, fixed again in 2.1.26.dfsg1-14

References

Bugs