#VU29368 Out-of-bounds read in ImageMagick - CVE-2020-13902

Vulnerability identifier: #VU29368

Vulnerability risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-13902

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ImageMagick
Client/Desktop applications / Multimedia software

Vendor: ImageMagick.org

Description

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

The vulnerability exists due to heap-based buffer over-read in "BlobToStringInfo" in "MagickCore/string.c" during TIFF image decoding. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ImageMagick: 7.0.9-27, 7.0.10-0 - 7.0.10-17

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External links
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20920
https://github.com/ImageMagick/ImageMagick/discussions/2132
https://github.com/ImageMagick/ImageMagick/commit/824f344ceb823e156ad6e85314d79c087933c2a0

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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.