9.8

CVE-2017-12868: simplesamlphp Session Fixation

CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2017-12868DEBIAN-CVE-2017-12868
Published 01-09-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-12868 is a critical (CVSS 9.8) Session Fixation vulnerability in simplesamlphp. EPSS estimates a 2.13% chance of exploitation in the next 30 days, higher than 81.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
2.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
DLA-1205-1DLA-1408-1

Timeline

  1. 01-09-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and earlier, when used with PHP before 5.6, allows attackers to conduct session fixation attacks or possibly bypass authentication by leveraging missing character conversions before an XOR operation.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.13%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

0.00 pp

From 2.13% on 22-09-2026

22-09-202622-10-2026
EPSS score
2.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • simplesamlphp< 1.14.15-1
Simplesamlphp1 product
Ubuntu1 product
  • simplesamlphpAll versions (No fix recorded)

3 vendors · 3 products

References

7 links