cbcvebase.
CVE-2009-0478
published 2009-02-08

CVE-2009-0478: Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid…

PriorityP340medium5CVSS 2.0
AVNACLAuNCNINAP
EXPLOIT
EPSS
71.99%
99.4th percentile
Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid version number, which triggers a reachable assertion in (1) HttpMsg.c and (2) HttpStatusLine.c.

Affected

27 ranges· showing 25
VendorProductVersion rangeFixed in
debiansquid< squid 2.7.STABLE3-4.1 (bookworm)squid 2.7.STABLE3-4.1 (bookworm)
squidsquid——
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squidsquid>= 0 < 2.7.STABLE3-4.12.7.STABLE3-4.1
squidsquid>= 0 < 2.7.STABLE3-4.12.7.STABLE3-4.1

Detection & IOCsextracted from sources · hover to see the quote

pathHttpMsg.c↗
pathHttpStatusLine.c↗
  • →Monitor Squid proxy logs or network traffic for HTTP request lines where the HTTP version field is non-standard (not HTTP/1.0 or HTTP/1.1), particularly with numeric values far outside the valid range or containing special characters. ↗
  • →Alert on assertion failures or crashes in Squid processes, specifically originating from HttpMsg.c or HttpStatusLine.c source files, which indicate exploitation attempts. ↗
  • ·The exploit targets Squid on port 80 in the PoC, but Squid typically listens on port 3128. Ensure detection rules cover the actual configured Squid proxy port in the environment. ↗
  • ·Affected versions are Squid 2.7 through 2.7.STABLE5, 3.0 through 3.0.STABLE12, and 3.1 through 3.1.0.4. Red Hat Enterprise Linux 2.1, 3, 4, and 5 ship unaffected versions and do not require mitigation. ↗

CVSS provenance

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
osv5.0MEDIUM
vendor_debian5.0MEDIUM
vendor_redhat5.0MEDIUM
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