Fedora 27 update for tor
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2017-0375 CVE-2017-0376 CVE-2017-0380 |
| CWE-ID | CWE-617 CWE-200 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Fedora Operating systems & Components / Operating system tor Operating systems & Components / Operating system package or component |
| Vendor | Fedoraproject |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Reachable Assertion
EUVDB-ID: #VU31417
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2017-0375
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the relay_send_end_cell_from_edge_ function via a malformed BEGIN cell.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 27
tor: before 0.3.1.7-1.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-b2c714515b
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Reachable Assertion
EUVDB-ID: #VU31418
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2017-0376
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the connection_edge_process_relay_cell function via a BEGIN_DIR cell on a rendezvous circuit.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 27
tor: before 0.3.1.7-1.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-b2c714515b
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Information disclosure
EUVDB-ID: #VU8851
Risk: Low
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-0380
CWE-ID:
CWE-200 - Exposure of sensitive information to an unauthorized actor
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists in the rend_service_intro_established() function in 'or/rendservice.c due to the system may log uninitialized stack contents when a certain hidden service error occurs while SafeLogging is disabled. A remote attacker can use an error message about the construction of an introduction point circuit and gain access to potentially sensitive information from uninitialized stack memory.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsFedora: 27
tor: before 0.3.1.7-1.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-b2c714515b
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
