CVE-2021-3697
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.46% probability · 39th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- gnu/grub2 · redhat/developer tools · redhat/openshift · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux for power little endian · redhat/enterprise linux for power little endian eus · redhat/enterprise linux server aus · redhat/enterprise linux server for power little endian update services for sap solutions · redhat/enterprise linux server tus · redhat/openshift container platform · redhat/codeready linux builder
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1991687Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202209-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220930-0001/Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1991687Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/202209-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220930-0001/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.