#VU29107 Uncontrolled Recursion in libexif - CVE-2018-20030

Vulnerability identifier: #VU29107

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-20030

CWE-ID: CWE-674

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libexif
Universal components / Libraries / Libraries used by multiple products

Vendor: libexif.sourceforge.net

Description

The vulnerability allows an attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to recursion issue when processing the EXIF_IFD_INTEROPERABILITY and EXIF_IFD_EXIF tags within libexif. A remote attacker can pass specially crafted data to the application and exhaust all available CPU resources.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libexif: 0.6.9 - 0.6.21

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-03/msg00000.html
https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00017.html
https://github.com/libexif/libexif/commit/6aa11df549114ebda520dde4cdaea2f9357b2c89

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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.