VulnerabilityModified

CVE-2021-32614

The length of the buffer is controlled by an attacker.

HIGH 7.1EPSS 0.91%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.91%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A flaw was found in dmg2img through 20170502. fill_mishblk() does not check the length of the read buffer, and copy 0xCC bytes from it. The length of the buffer is controlled by an attacker. By providing a length smaller than 0xCC, memcpy reaches out of the malloc'ed bound. This possibly leads to memory layout information leaking in the data. This might be used in a chain of vulnerability in order to reach code execution.

CVSS 3.1: 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
EPSS: 0.91% probability · 58th percentile
CISA KEV: Not listed
Weakness: CWE-125
Affected: dmg2img project/dmg2img
Source: patrick@puiterwijk.org

References

https://bugzilla.redhat.com/show_bug.cgi?id=1959911Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1959911Issue Tracking, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.