Heap-based buffer overflow in perl (Alpine package)

1) Heap-based buffer overflow

EUVDB-ID: #VU11833

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-6797

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition or execute arbitrary code on the target system.

The weakness exists in S_regatom() in 'regcomp.c' due to heap-based buffer overflow. A local attacker can exploit a specially crafted regular expression, trigger memory corruption and cause the service to crash or run Perl code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install update from vendor's website.

Vulnerable software versions

perl (Alpine package): 5.24.3-r1

External links

http://git.alpinelinux.org/aports/commit/?id=22ea72268934176905fbf70461eb7a7210be1a76
http://git.alpinelinux.org/aports/commit/?id=f78615592ddca9ab00bdcc95ff939df19b557ca6
http://git.alpinelinux.org/aports/commit/?id=b016cc93af3bf95f617ec73a5e75228aed3235fc

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.