A certificate validation issue was addressed.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 16.7, 13.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Apple's macOS, iOS, and iPadOS are affected by a certificate validation flaw that could let a malicious app bypass signature checks. Those checks are meant to confirm that an app comes from a trusted source and hasn't been altered.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A certificate validation issue was addressed. This issue is fixed in macOS Ventura 13.6, iOS 16.7 and iPadOS 16.7. A malicious app may be able to bypass signature validation. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Apple iOS and iPadOS
From unspecified · fixed in 16.7
- Apple macOS
From unspecified · fixed in 13.6
References 2
support.apple.com
Questions about CVE-2023-41991
What does this mean?
A malicious app may be able to bypass signature validation. The fact sheet describes this as a certificate validation issue, which Apple addressed.Source: support.apple.com
Am I affected, and how do I check?
The checked facts list Apple iOS and iPadOS with no introduced version given, and Apple macOS with no introduced version given. To check a device, compare its version under Settings > General > About (iOS and iPadOS) or the Apple menu > About This Mac (macOS) against the fixed versions.Source: support.apple.com
What should I do about it?
Update iOS and iPadOS to 16.7 or later, and update macOS to 13.6 or later.Source: support.apple.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2023-09-25, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data