Symbolic link following in p7zip

1) Link following

EUVDB-ID: #VU33137

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-1038

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to the application follows symlinks when extracting files. A remote attacker can create a specially crafted archive, trick the victim into opening it and overwrite arbitrary files on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

p7zip: 9.20.1

CPE2.3

• cpe:2.3:a:p7zip.sourceforge.net:p7zip:9.20.1:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2015-December/173245.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-December/174245.html
https://lists.opensuse.org/opensuse-updates/2015-07/msg00000.html
https://www.debian.org/security/2015/dsa-3289
https://www.openwall.com/lists/oss-security/2015/01/11/2
https://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
https://www.securityfocus.com/bid/71890
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774660
https://bugzilla.redhat.com/show_bug.cgi?id=1179505
https://exchange.xforce.ibmcloud.com/vulnerabilities/99970

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.