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VPR Score: 3.6
SynopsisThe remote Debian host is missing a security update.
DescriptionSeveral hidden service related denial of service issues have been discovered in Tor, a connection-based low-latency anonymous communication system.
o 'disgleirio' discovered that a malicious client could trigger an assertion failure in a Tor instance providing a hidden service, thus rendering the service inaccessible. [CVE-2015-2928]
o 'DonnchaC' discovered that Tor clients would crash with an assertion failure upon parsing specially crafted hidden service descriptors.
o Introduction points would accept multiple INTRODUCE1 cells on one circuit, making it inexpensive for an attacker to overload a hidden service with introductions. Introduction points no longer allow multiple such cells on the same circuit.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected tor, tor-dbg, and tor-geoipdb packages.