FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

OpenSMTPD -- multiple vulnerabilities

Affected packages
opensmtpd < 5.7.2,1

Details

VuXML ID ee7bdf7f-11bb-4eea-b054-c692ab848c20
Discovery 2015-10-02
Entry 2015-10-04
Modified 2015-10-06

OpenSMTPD developers report:

an oversight in the portable version of fgetln() that allows attackers to read and write out-of-bounds memory

multiple denial-of-service vulnerabilities that allow local users to kill or hang OpenSMTPD

a stack-based buffer overflow that allows local users to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user

a hardlink attack (or race-conditioned symlink attack) that allows local users to unset the chflags() of arbitrary files

a hardlink attack that allows local users to read the first line of arbitrary files (for example, root's hash from /etc/master.passwd)

a denial-of-service vulnerability that allows remote attackers to fill OpenSMTPD's queue or mailbox hard-disk partition

an out-of-bounds memory read that allows remote attackers to crash OpenSMTPD, or leak information and defeat the ASLR protection

a use-after-free vulnerability that allows remote attackers to crash OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd user

References

CVE Name CVE-2015-7687
URL https://www.opensmtpd.org/announces/release-5.7.2.txt