CVE-2019-12525
Published Jul 11, 2019 · Updated Oct 23, 2026
Original summary
Normalized public record · Updated Oct 23, 2026
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- MEDIUM
- Confidence
- 20%
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- www.squid-cache.org ↗
- Source repository ↗
- www.squid-cache.org ↗
- USN-4065-1 ↗
- [debian-lts-announce] 20190720 [SECURITY] [DLA 1858-1] squid3 security update ↗
- USN-4065-2 ↗
- FEDORA-2019-cb50bcc189 ↗
- DSA-4507 ↗
- 20190825 [SECURITY] [DSA 4507-1] squid security update ↗
- openSUSE-SU-2019:2540 ↗
- openSUSE-SU-2019:2541 ↗
- [debian-lts-announce] 20200710 [SECURITY] [DLA 2278-1] squid3 security update ↗
Record history
Published Jul 11, 2019 · Last refreshed Oct 23, 2026