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, remote attackers can cause a denial of service (NULL pointer dereference and application crash) against directory authorities via a malformed descriptor, aka TROVE-2017-010.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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, the replay-cache protection mechanism is ineffective for v2 onion services, aka
    TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue. (CVE-2017-8819)

  - 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, remote attackers can cause a denial of service (NULL pointer dereference and
    application crash) against directory authorities via a malformed descriptor, aka TROVE-2017-010.
    (CVE-2017-8820)

  - 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, an attacker can cause a denial of service (application hang) via crafted PEM
    input that signifies a public key requiring a password, which triggers an attempt by the OpenSSL library
    to ask the user for the password, aka TROVE-2017-011. (CVE-2017-8821)

  - 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, relays (that have incompletely downloaded descriptors) can pick themselves in a
    circuit path, leading to a degradation of anonymity, aka TROVE-2017-012. (CVE-2017-8822)

  - 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. (CVE-2017-8823)

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	Type	Severity
400754	Alpine: multiple tor packages: security update to 0.3.1.8-r1 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
400754	Alpine: multiple tor packages: security update to 0.3.1.8-r1 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
105965	Fedora 27 : tor (2017-bc2edc421d)	Nessus	Fedora Local Security Checks	Local	high
105334	Fedora 26 : tor (2017-bce9e03721)	Nessus	Fedora Local Security Checks	Local	high
105227	openSUSE Security Update : tor (openSUSE-2017-1336)	Nessus	SuSE Local Security Checks	Local	high
104975	Debian DSA-4054-1 : tor - security update	Nessus	Debian Local Security Checks	Local	high

Detections

Analytics

CVE-2017-8820

high

Tenable Plugins

high

high

high

high

high

high