CVE-2013-4122
Publication date 18 July 2013
Last updated 24 July 2024
Ubuntu priority
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.
Status
Package | Ubuntu Release | Status |
---|---|---|
cyrus-sasl2 | ||
14.04 LTS trusty |
Not affected
|
|
Notes
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
Patch details
Package | Patch details |
---|---|
cyrus-sasl2 |
References
Related Ubuntu Security Notices (USN)
- USN-1988-1
- Cyrus SASL vulnerability
- 9 October 2013
- USN-2755-1
- Cyrus SASL vulnerability
- 30 September 2015