OSV bug: invalid parsing of fixed versions and affected versions.

[ziadhany]

Parsing of introduced version in OSV not working as expected. See the example below:

This bug was discovered by @keshav-space . at #2017 (review)
See the example below:

In [1]: from vulnerabilities.importers import osv

In [2]: raw_data = {
   ...: "schema_version": "1.4.0",
   ...: "id": "GHSA-2hjr-vmf3-xwvp",
   ...: "aliases": [
   ...:   "CVE-2023-49921"
   ...: ],
   ...: "summary": "summary",
   ...: "details": "details",
   ...: "severity": [],
   ...:   "affected": [
   ...:     {
   ...:       "package": { "ecosystem": "Maven", "name": "org.elasticsearch:elasticsearch" },
   ...:       "ranges": [
   ...:         {
   ...:           "type": "ECOSYSTEM",
   ...:           "events": [
   ...:             {"introduced": "0"},
   ...:             {"fixed": "7.17.16"}
   ...:           ]
   ...:         }
   ...:       ]
   ...:     },
   ...:     {
   ...:       "package": { "ecosystem": "Maven", "name": "org.elasticsearch:elasticsearch" },
   ...:       "ranges": [
   ...:         { "type": "ECOSYSTEM",
   ...:         "events": [
   ...:             { "introduced": "8.0.0" },
   ...:             { "fixed": "8.11.2" }
   ...:           ]
   ...:         }
   ...:       ]
   ...:     }
   ...:   ],
   ...:   "references": []
   ...: }

In [3]: advisory_url ="https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/07/G
   ...: HSA-2hjr-vmf3-xwvp/GHSA-2hjr-vmf3-xwvp.json"

In [4]: supported_ecosystems= ["maven"]

In [5]: advisory_text=""

In [6]: adv=osv.parse_advisory_data_v2(raw_data,supported_ecosystems,advisory_url,advisory_text)

In [7]: len(adv.affected_packages)
Out[7]: 2

In [8]: af1=adv.affected_packages[0]

In [9]: af2=adv.affected_packages[1]

In [10]: str(af1.affected_version_range)
Out[10]: 'None'

In [11]: str(af1.fixed_version_range)
Out[11]: 'vers:maven/7.17.16'

In [12]:

In [12]: str(af2.affected_version_range)
Out[12]: 'None'

In [13]: str(af2.fixed_version_range)
Out[13]: 'vers:maven/8.11.2'

In the above example af2.affected_version_range shouldn't be none we are completely missing 8.0.0.

Additionally, we should process fixed versions individually, either ingesting them or skipping only the invalid entries instead of discarding the entire list.

@TG1999 Reference: #2017 (comment)

> `Invalid VersionRange for affected_pkg: ['0.8', '0.9', '0.9.3', '0.9.4', '0.9.5', '0.9.6', '0.9.7', '0.9.8', '0.9.9', '2.0.1', '2.0.1rc1', '2.0.1rc2-git', '2.0.1rc3', '2.0.1rc4', '2.0.2', '2.0.3', '2.0.4', '2.0.5', '2.0b4', '2.0b5', '2.0b6', '2.0b7', '2.0b8', '2.0b9', '3.0.0', '3.0.0b1', '3.0.0b2', '3.0.1', '3.0.2', '3.0.3', '3.0.4', '3.0.5', '3.1', '3.2', '3.2.1', '3.2.2', '3.2.3', '3.2.4', '3.2.5', '3.3', '3.4', '3.4.1', '3.4.2', '3.4.3', '3.4.4', '3.4.5', '3.5', '3.5b1', '3.6', '3.6.1', '3.6.2', '3.6.3', '3.6.4'] for OSV id: 'PYSEC-2021-859': error:InvalidVersion("'2.0.1rc2-git' is not a valid <class 'univers.versions.PypiVersion'>")`
> 
> One of the list might not be a valid version, but all others are valid, are we ingesting them or skipping whole list if we can't ingest one.

[ziadhany]

To fix this issue, I think we should update the OSV parser so that it does not ignore introduced versions. We should try to ingest all available data and create both affected_version_range and fixed_version_range. This way, if affected versions are not available, we can still extract them from the ranges section:

"ranges": [
    {
        "type": "GIT",
        "repo": "https://github.com/pikepdf/pikepdf",
        "events": [
          { "introduced": "0" },
          { "fixed": "3f38f73218e5e782fe411ccbb3b44a793c0b343a" }
        ]
    },
    {
        "type": "ECOSYSTEM",
        "events": [
          { "introduced": "2.8.0" },
          { "fixed": "2.10.0" }
        ]
    }
],
"versions": [
        "2.8.0", "2.8.0.post1", "2.8.0.post2", "2.9.0", "2.9.1", "2.9.2"
],

Steps:

• Update or rename functions to correctly return these fixed/affected versions.
• Update the affected version parsing to skip only the invalid entries.
• Update the OSV importer to support fix commits: Add support for git version ranges #767