libexif up to 0.6.21 libexif/exif-data.c exif_data_save_data_entry out-of-bounds

Summaryinfo

A vulnerability was found in libexif up to 0.6.21 and classified as critical. The affected element is the function exif_data_save_data_entry of the file libexif/exif-data.c. The manipulation results in out-of-bounds. This vulnerability is reported as CVE-2017-7544. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in libexif up to 0.6.21. Affected is the function exif_data_save_data_entry of the file libexif/exif-data.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

libexif through 0.6.21 is vulnerable to out-of-bounds heap read vulnerability in exif_data_save_data_entry function in libexif/exif-data.c caused by improper length computation of the allocated data of an ExifMnote entry which can cause denial-of-service or possibly information disclosure.

The bug was discovered 07/04/2017. The weakness was disclosed 09/21/2017 (Website). The advisory is shared for download at sourceforge.net. This vulnerability is traded as CVE-2017-7544 since 04/05/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 79 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104329 (EulerOS 2.0 SP1 : libexif (EulerOS-SA-2017-1276)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Huawei Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170708 (SUSE Enterprise Linux Security Update for libexif (SUSE-SU-2018:0193-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (104329). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• libexif

Version

• 0.6.0
• 0.6.1
• 0.6.2
• 0.6.3
• 0.6.4
• 0.6.5
• 0.6.6
• 0.6.7
• 0.6.8
• 0.6.9
• 0.6.10
• 0.6.11
• 0.6.12
• 0.6.13
• 0.6.14
• 0.6.15
• 0.6.16
• 0.6.17
• 0.6.18
• 0.6.19
• 0.6.20
• 0.6.21

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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