#VU39065 Division by zero in lrzip - CVE-2017-8842

Vulnerability identifier: #VU39065

Vulnerability risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-8842

CWE-ID: CWE-369

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
lrzip
Other software / Other software solutions

Vendor: ckolivas (Con Kolivas)

Description

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

The vulnerability exists due to divide-by-zero error within The bufRead::get() function in libzpaq/libzpaq.h in liblrzip.so in lrzip 0.631. A remote attacker can perform a denial of service (divide-by-zero error and application crash) via a crafted archive.

Mitigation
Install update from vendor's website.

Vulnerable software versions

lrzip: 0.631

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External links
https://blogs.gentoo.org/ago/2017/05/07/lrzip-divide-by-zero-in-bufreadget-libzpaq-h/
https://github.com/ckolivas/lrzip/issues/66
https://security.gentoo.org/glsa/202005-01

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.