#VU39066 NULL pointer dereference in lrzip - CVE-2017-8843

Vulnerability identifier: #VU39066

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-2017-8843

CWE-ID: CWE-476

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 a NULL pointer dereference error. A remote attacker can trigger denial of service conditions 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-null-pointer-dereference-in-join_pthread-stream-c/
https://github.com/ckolivas/lrzip/issues/69
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.