Debian update for tor



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-38385
CWE-ID CWE-617
Exploitation vector Network
Public exploit N/A
Vulnerable software
 tor (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Reachable Assertion

EUVDB-ID: #VU56095

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-2021-38385

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion caused by a behavior mismatch between our batch-signature verification code and our single-signature verification code. A remote attacker can trigger assertion failure and perform a denial of service attack.

Mitigation

Update tor package to one of the following versions: 0.3.5.16-1, 0.4.5.10-1~deb11u1.

Vulnerable software versions

tor (Debian package): 0.3.5.3-alpha-1 - 0.4.5.2-alpha-1

CPE2.3 External links

https://www.debian.org/security/2021/dsa-4961


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.



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