In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, there is a use-after-free in onion service v2 during intro-point expiration because the expiring list is mismanaged in certain error cases, aka TROVE-2017-013.

update to upstream release 0.3.1.9. Fixes various CVEs :

  - CVE-2017-8819: Replay-cache ineffective for v2 onion     services

  - CVE-2017-8820: Remote DoS attack against directory     authorities

  - CVE-2017-8821: An attacker can make Tor ask for a     password

  - CVE-2017-8822: Relays can pick themselves in a circuit     path

  - CVE-2017-8823: Use-after-free in onion service v2

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

update to upstream release 0.3.1.9. Fixes :

  - CVE-2017-8819: Replay-cache ineffective for v2 onion     services

  - CVE-2017-8820: Remote DoS attack against directory     authorities

  - CVE-2017-8821: An attacker can make Tor ask for a     password

  - CVE-2017-8822: Relays can pick themselves in a circuit     path

  - CVE-2017-8823: Use-after-free in onion service v2

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for tor fixes vulnerabilities that allowed some traffic confirmation, DoS and other attacks (bsc#1070849) :

  - CVE-2017-8819: Replay-cache ineffective for v2 onion     services

  - CVE-2017-8820: Remote DoS attack against directory     authorities

  - CVE-2017-8821: An attacker can make Tor ask for a     password

  - CVE-2017-8822: Relays can pick themselves in a circuit     path

  - CVE-2017-8823: Use-after-free in onion service v2

Multiple vulnerabilities have been found in Tor, a connection-based low-latency anonymous communication system.

ID	Name	Product	Family	Severity
105965	Fedora 27 : tor (2017-bc2edc421d)	Nessus	Fedora Local Security Checks	high
105334	Fedora 26 : tor (2017-bce9e03721)	Nessus	Fedora Local Security Checks	high
105227	openSUSE Security Update : tor (openSUSE-2017-1336)	Nessus	SuSE Local Security Checks	high
104975	Debian DSA-4054-1 : tor - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2017-8823

high

Tenable Plugins

high

high

high

high