#VU39067 Heap-based buffer overflow in lrzip - CVE-2017-8844

Vulnerability identifier: #VU39067

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-8844

CWE-ID: CWE-122

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 execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in The read_1g function in stream.c in liblrzip.so in lrzip 0.631. A remote attacker can use a crafted archive. to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

lrzip: 0.631

---

External links
https://blogs.gentoo.org/ago/2017/05/07/lrzip-heap-based-buffer-overflow-write-in-read_1g-stream-c/
https://github.com/ckolivas/lrzip/issues/70
https://security.gentoo.org/glsa/202005-01

---

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.