Out-of-bounds read in libarchive (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU33272

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-2015-8934

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary error in the copy_from_lzss_window function in archive_read_support_format_rar.c. A remote attacker can create a crafted rar file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libarchive (Alpine package): 3.0.2-r0 - 3.2.0-r0

CPE2.3

• cpe:2.3:o:alpine:libarchive_alpine_package:3.0.2-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:libarchive_alpine_package:3.0.2-r1:*:*:*:*:alpine_linux:*:2.2
• cpe:2.3:o:alpine:libarchive_alpine_package:3.0.4-r0:*:*:*:*:alpine_linux:*:2.3

External links

https://git.alpinelinux.org/aports/commit/?id=99073b453f33a5d1dd05323701be2557e6cd4905
https://git.alpinelinux.org/aports/commit/?id=1245e3e71c664fc180d3a6f17a8aac878007bed2

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.