#VU33365 Use-after-free - CVE-2019-11050

Vulnerability identifier: #VU33365

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11050

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

When PHP EXIF extension is parsing EXIF information from an image, e.g. via exif_read_data() function, in PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0 it is possible to supply it with data what will cause it to read past the allocated buffer. This may lead to information disclosure or crash.

Mitigation
Install update from vendor's website.

External links
https://lists.opensuse.org/opensuse-security-announce/2020-01/msg00036.html
https://bugs.php.net/bug.php?id=78793
https://lists.debian.org/debian-lts-announce/2019/12/msg00034.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N7GCOAE6KVHYJ3UQ4KLPLTGSLX6IRVRN/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XWRQPYXVG43Q7DXMXH6UVWMKWGUW552F/
https://seclists.org/bugtraq/2020/Feb/27
https://seclists.org/bugtraq/2020/Feb/31
https://security.netapp.com/advisory/ntap-20200103-0002/
https://usn.ubuntu.com/4239-1/
https://www.debian.org/security/2020/dsa-4626
https://www.debian.org/security/2020/dsa-4628

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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.