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CVE-2018-1000005Date: (C)2018-01-30   (M)2024-02-01


libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 9.1CVSS Score : 6.4
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 5.2Impact Score: 4.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
SECTRACK-1040273
DSA-4098
RHSA-2019:1543
USN-3554-1
https://curl.haxx.se/docs/adv_2018-824a.html
https://github.com/curl/curl/pull/2231

CPE    4
cpe:/o:debian:debian_linux:9.0
cpe:/o:debian:debian_linux:8.0
cpe:/o:canonical:ubuntu_linux:16.04::~~lts~~~
cpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~
...
CWE    1
CWE-125
OVAL    14
oval:org.secpod.oval:def:1800705
oval:org.secpod.oval:def:1600843
oval:org.secpod.oval:def:1800161
oval:org.secpod.oval:def:2101922
...

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