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CVE Record

CVE-2019-12529: An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7.

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This Squid proxy issue can expose nearby process memory when Basic Authentication parses a malformed Proxy-Authorization header. The practical data-loss path is narrower: sources say decoded data would be visible only if Squid was configured to display usernames on error pages. Organizations running Squid as an authenticated HTTP proxy are the relevant population. Highest concern is older Squid deployments using Basic Authentication, especially where custom error pages display usernames. Prioritize remediation for authenticated Squid proxies that handle sensitive traffic or are reachable by broad user populations. The issue is not listed as actively exploited in the provided sources, but it can create unintended memory disclosure under specific configurations. Mitigation focus: Apply Squid security updates from your operating-system vendor or upstream Squid guidance.; Upgrade beyond the affected Squid releases listed in the CVE record.; Disable Basic Authentication if it is not required for the proxy..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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Affected products

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